I followed Father Fish's way. Now pretty much first year over, no water changes. All good.

What people either don't know or forgot is that people used to keep fish without filters, heaters and artificial lights not so long ago. During my 58+ years in the hobby I have successfully kept aquariums setup and functioning in many different ways. One thing I noticed was there's more to aquarium water than we have test kits for. Example: I had a 55G tank setup and occupied for about a year with just topping off all going great. I monitored the water parameters regularly. I bought some new fish and quarantined them for two months. No problems raised it's ugly head so I introduced them to the 55G. In less than a month the fish were exhibiting bad strange behavior. I talked with my favorite old timer at my LFS. He suggested quick somewhat large water changes for a few days. Sure enough they pulled through and lived a long and healthy life. I have always relied on the tank itself to house the beneficial bacteria; glass, substrate, rocks, driftwood, plants, etc... I only added either box filters, sponge filters or HOB's to polish the water and keep it crystal clear. I always cleaned such filters under my chlorinated tap water. My fry/grow out tanks were always bare with a box or sponge filter and heater. I kept the viewing panel clean but let the other sides form algae. I would siphon the uneaten food and debris from the bottom every two days with a 20-25% water change. I found that gave me best results in having larger survival rates and quicker growing. For three plus decades I kept a large community display tank utilizing an UGF, HOB and at the time the best plant growing lights. The plants and fish all did just fine with no issues or tank break downs. I started in the hobby as a wee-lad and followed the advice from my favorite old timer. As I caught that MTS disease as I grew older I started experimenting with different ways of keeping aquariums. There are "many" ways to keep them successfully. I can not follow KZfaqr's that preach "my way is the only way to be successful". Sorry Father Fish but your 6" deep substrate method may work but it is NOT the only way. And not feeding your fish, really?? The internet started as a good thing. But over the decades it went down hill. There are too many self proclaimed experts and bashers. Lucas, you do you! I love what you do for the hobby bro. Call out the haters and don't let them get to you. 😉 Sorry for the essay.

Father fish & secret history got me started 🙌🐟 And as soon as you said "All natural " I subscribed ✅

When you broke down the ‘cichlid guys’ and the ‘natural guys’ you said it all; so simple. I have a planted tank and an mbuna tank among others, but treat them so differently. Second, when you said aggression with sugar coat bothered you; I felt the same and responded to all three channels. KG was the best example of this. I still enjoy Ben O’s videos, but it was hard for me to take Caveman too serious with his 90% water changes with pushing of sea hem products. Don’t get me wrong, his fish do look great. Thanks for your video, it’s the voice of reason here. Keep doing what you do…

FISH JESUS! 😇

i have four tanks. two weeks ago, i broke one down and built it father fish style. then i went to phillips fish works and bought four bags of bugs. put three in tanks and one in a gallon pickle jar to watch it grow. think i'm going to put together a jar for my grandson. i think this is a great kid project. i don't do water changes on my tanks anymore. they are so stable. i was always going for the natural style, heavy planted w/o knowing about natural tanks. wish i was introduced to this when i started, sure would have saved me hella money! thank you for the awesome video! ☮️

Good for you bud.. I started fish tanks many years ago doing water changes and chemo treatment…lol now I enjoy my all natural dirted tanks with my substrates from my river and lake i live on..a natural biodiversity living in them with smaller fish..and ya thanks for sticking up for fatherfish❤..I noticed after his video on NO WATER CHANGES. I AGREE! Everyone came out and we’re debating it,,lol they don’t get it..’keep fish great again’ loving your tanks..😊 peace brother🎉..

Hi guys, I only started aquarium keeping 3 months ago when I was diagnosed with an illness and am home bound. I found it very stressful when doing my research and nearly gave up because of all of the different and contradictory do's and don't. I live in tropical Queensland Australia and I have to cool my tanks and not heat them which is a pain but you guys and LRB have made me happy to have aquariums (I started with one and now I have 4 x 20 litre nano tanks.❤❤

LRB always chill and grounded. Love it.

100% LRB I was one of the lucky ones that got the last 5 mascara Barb’s and those fish came so healthy they didn’t give me one problem they were swimming around like they were born in my tank and never went through the mail, so heathy and happy I adopted your no filter method a year ago on all my 11 tanks and my plants and fish grow better than ever with rare water changes thank you for all the great things you have done in the hobby

Thanks Lucas 👍 4 All Your Wisdom 😘 Following your ways & recommendations (including 2 watch FF) enabled me to LOVE & Thrive in this hobby 💋🐟🦐🌿

Hi Lucas, I wasn’t aware you had chimed in on this until John mentioned you in his live stream. Great stream. I too get “therapy”from water changes and general aquarium care. So true about fish keepers being vital to certain species, like the Paratilapia polleni which has disappeared in the wild. I’ve expanded into a variety of fish but still a big Cichlid keeper. If you’d ever like to discuss these different worlds in a collab, I’m game 😉😀👍🏻

Thanks Lucas. Your insight and your honesty is more appreciated than you realize. Thank you!

I’m finding that lighting is crucial for plant growth to enable the natural balance. I love the deep substrate low maintenance method now 😍

I have multiple tanks and a 10 gallon. The filter stopped, and I didn't notice, so I just never fixed it now it's doing fine it has 10 of your blue rice fish in it, and it's heavily planted

I breed Guppies for a hobby, not for show. I'm also disabled. Weekly/frequent water changes are literally not physically possible for me. I also feel like they're complete drudgery. I do top offs as necessary and do big volume water changes quarterly (4 times a year). That meets my needs for maintaining my fish. My tanks aren't sparkling spotless clean. They have mulm and algae and occasionally green water and I'm ok with all that. It's beneficial for my growing babies. I keep floating plants. I feed moderately and don't push for huge growth because I don't need it. I breed for color and hardiness. So less frequent water changes works just fine for me.

I’m in both worlds, I have a large tank with cichlids and can’t have plants in it, so water changes are a must intermittently. My others are small nano planted tanks. I do maintenance on them differently.

I agree 100%. Unfortunately father fish got mad at me when I tried to remind him that the "filterless" advice is not for beginners but more for a semi experienced aquarist

Shrimp jesus your a natural world legend 😊 kg dont seem the friendliest to me apart from yourself i only watch father fish and aquarium coop.your most definitely the most compassionate chilled out fish/shrimp jesus dude keep it up

Doing a bit of maintenance on my big tank whilst watching this and found a baby chilli rasbora in the sump. Its mega 'dirty' so cant see much but he's now in the main tank looking a little bewildered. Super chuffed ... long live 'dirty' tanks :)

I never do water changes. Just top ups. My fish are fine and plants too. And saves me a lot of time

I appreciate the video. When people argue about their way of aquarium keeping being the “right way”, it’s like arguing that an apple is better than an orange.

That is so true about water changes killing fish. It all depends on the quality of your source water. People in our hobby obsess about their tank water. Source water is critical. I am blessed with natural source water - it is almost impossible to kill a fish with it. I also use rain water but that can be deadly if not used right. Bad source water can be improved gradually over time (best not to change it too much) imo, depending on how many fish you have of course.

Made me realize I have 6 tanks: 55 gal planted w/goldfsh and guppies, 10 gal "foodweb," 5 gal planted betta, 2.5 gal aquatic turtle deep substrate "tank" in his habitat, 1 gal "resurrection jar," 0.5 gal glass cylinder planted w/guppy.

Go all FishJesus - love that image:) You have a great message for everyone. Do what works for you to have healthy fish and enjoy the hobby. I've got a mix of hands off and hands on with 6 tanks and 15 nanos. The more plants and tiny critters I have, the better the water seems to be and better water means better fish for me.

I have 4 nano, no filters/water change on them after killing all my fish during a water change. So lesson learned, no water changes for me only topping off what’s evaporated. The only thing is that I clean the glass of them. What I have inside is a lot of plants and snails in them.

100% AGREE 👍 we all need to get along.we have mason jars to 275 gallon tank with a 55 gallon filter. Scuds-to 35 sunfish

Good video & well said. I’ve converted 3 of my 5 tanks to deep substrate & cut my maintenance by 75%.

My water changes are based on the tank. Some tanks get a water change once a month, some could go months without a water change. My tanks have mulm and algae. I work a lot. I am happy to have algae and floating plants. They help keep my tanks balanced. My oscars' tank and my axolotl's tank need more frequent water changes than my planted community tanks. There is no 100% right way to keep fish. Lordy, people need to chill. Do what is best for your fish and the environment you are keeping them in.

Great video mate. I’ve kept tanks for years now and unknown to me always have used the walstead method. I just wanted to make my tanks as natural as possible trying to see the fish as wild as they could be. I thought it would be a happier place for the fish to live. I tell anyone new to the game who comes round and sees my tanks to use dirt and have more plants then fish. Always worked for me. My personal opinion was a few years ago that kg Tropicals was the most patronising fish videos on KZfaq. Keep up the great work dude and soon I will have the courage to set up a tank with no filter. Peas out bro.

Thanks for doing this video. I agree with the vast majority of what you said, and I love that you focus on the natural systems. I do want to say that Bulk Reef Supply is a relatively large company I really respect. They do their own experiments that they document. Not everything they do is amazing, but I do think they’re generally helpful and thoughtful.

I have both styles of tanks setup(planted and large cichlid s) My 125 is a Frontosa colony(6 large/medium) and 2 large Angels. Use to do water changes weekly but now i grow house plants on top with roots in tank (pothos, monstera, peace lily, lucky bamboo). Doing this i change water once every 2 months or longer now.

We all have our ways. Your way cuts out profit for some. Keep being you!!!!

Can you put together a pond tank with all water plus animals and organisms from your ponds out on your property? I would love to see that.

Lucas, does Not surprise me that Kaveman or neither of them took you up on your co live stream to discuss the 'differences' in the styles of fish keeping of the two 'different kinds of fish that we are keeping. Like you Lucas, Father Fish and Alexander/Alex say, there are many tank set ups and different methods that you can you use to keep healthy fish.. Having said that, I have 1 cichlid tank set up out of my current running 14 tanks, that is set up the natural way and it does and looks awesome! Why does my cichlid tank succeed this 'natural way' because it is not OVERSTOCKED & NOT OVERFED and planted, I've created a food web etc. Natural way!

I have found that I need to change water often on my killifish growout tanks. If I don't, they don't grow. It must be a hormone thing. Most of my other tanks, I don't need to change the water very often. It usually changed because I just don't like the way it's starting to look. I just use a bare airline and no filtration on almost all my tanks. Lots of plants are the key for me.

I dont do them nearly as much as I was told but all my tanks are crystal clear, inhabitants are healthy and the plants thrive. I've lost more fish and shrimp after 75% water changes than anything else including a cat peeing in the HOB.

Have you watched all of KG Tropicals video? I didnt see him throwing shade at anyone. I could see how it was misleading if you didnt watch all of it. He even says Father Fish is correct!!!

Thank you, LRB. I’m glad you took care of that 🙏✌

For my tanks with the fish I keep I do the natural method. Never do water changes except when I take some water from the established tank and jump start the new natural tank. No chemicals other then dechlorinator when I top off my tanks.

so, I do water changes, I also have at least a sponge filter in every tank, and all of my tanks except one 29 gallon have deep darted substrate that are heavily planted. the 29 gallon has a little sand and a bunch of leaves in the bottom, it has an incredibly large peace Lilly growing out of the top and a real big pothos plant rooted in the hang on back, it also is almost entirely covered in pennywort and pearl weed. it is the only tank that gets frequent water changes , I do a 1/4 change on it weekly Because its the tank my bristle nose plecos breed in so I feed it a lot of green beans , zucchini etc. it also house 10 or so Cory cats. I like doing water changes, but all my other tanks get them about once a month I don't really have a set schedule. no matter what anybody says I have learned more from you, Father fish, and Alexander Williamson in the last few years , than I learned on my own in the last 40 ! I got my first tank in 1984 , but long before that I was catching gambusia and crawdads out the local creeks and keeping them in any container that would hold water !

tanks are dirty? in our eyes only, if your fish is breeding its not dirty but a profitable tank

Thank you Lucas. I'm starting a cichlid tank and I can't do it like I normally do ( lots of plants and no vac). I realise there is a place for everything and everything in its place. Thank you for your time and advice. It's been valuable to me.

I watch all your stuff, and youre the only channel I really never ever disagree with! Especially on this topic

Always so level headed, appreciate your knowledge.

Im in the no change, lots of plants, have done so for years, everyone should just do what they like and enjoy the aquarium....

Thanks To you for keeping it friendly and noting it all depends, I’m an in the middle. Air driven filters some power, greenwater tanks

I've had tanks forever. I've been listening to you for a long while now. I don't do water changes and just top off now because salt is sometimes in my tap water. I live on the East Coast and this place is surrounded by fresh and salt water. I try to continue a natural balance. To each their own though. Take Care and Stay Safe.🖖

I was exchanging comments with Patty’s Aquatics since I am doing my research before I start my first dirtied filterless aquarium, and in between comments he mentioned your channel. I also commented that before finding his channel, and other channels like FF, I truly didn’t know much about dirtied filterless aquariums. This is such an important time in the hobby for me since I find this practice absolutely amazing and incredibly addictive! I love your comments on this video about the hobby, and I truly didn’t know there was quite some drama going on. This is so unfortunate. I’ve always experienced nothing but respect from this community, and when time of need came in the sense of information, this community has always been there to assist. Hope we all find a common ground and come to an agreement that we ALL need each other for the sake of the hobby. Subbed.

You have awesome beautiful tanks man. You and father fish have inspired me to start doing natural tanks....

I think the cichlid people are incorrectly concluding that this is a cichlid vs nano fish/planted tank issue. It's not. Cichlid tanks and monster fish tanks benefit all the same from microbial communities growing on surface area like deep substrates. Newcomers may not know that Father Fish kept many cichlids and monster fish in his shop which can be found in his earlier videos. Personally, I've kept tilapia-sized fish and small fish, and I fail to see how there is a divide in fishkeeping "principles" between them. Theyre all the same. A larger fish may eat bigger food, but it eats less often (which hobbyists tend to overfeed). So the water quality is not unmanageable for it's size.

Love it! I keep a ton of plecos..all that natural alge and mulm is fantastic. I do have an automatic change system but it's now rare that I use it. Once Every couple weeks.

spot on. need to spread more of these videos

100% mate, there is many ways to get the same outcome. Lace man is throwing rocks at glass windows. Love your work , from Australia 🇦🇺

The bacopa tank looks AWESOME, you asked how the camera vision was doing & it was a little blury in spots but if you moved too fast it'd mess up.

I'm working on growing more plants dialing in my aquarium lighting. Years ago my tank was near my window but i moved. now i have one of the 'fancy' led's and another tank just has fluorescent lighting. Both are doing well. My long term plan is to do very few water changes but my water is very soft so i need to do a water change every now and then or i lose fish slowly one by one. I love how your plants are doing LRB! I'm planning on buying some of your plants soon to add and start up summer tubbing season soon.

I found this channel after watching Father Fish earlier and it turned out to be very good, friend. You want to reunite with this hobby.

My thing now is nano fish in a big planted tank. I was 100% chasing big fish for my big tanks when I was newer in the hobby. These tanks are way cooler and more interesting now that they are filled with plants and shrimp and some fish... There is a ton of action!!

Keep up the great work, I personally have tanks that are crystal clear, others, not so much. I believe each one does well or different reasons. I have happy shrimps, I have happy fishes, that's what is important to mee! Thanks for your educational vid's!

You said it right, I think it depends a ton on what fish you are keeping

Totally agree I’ve tank I keep crystal clear like aquascape that I change water weekly and I’ve another tank I almost never change great video ❤👏👏👏👏👏

Your a 💯 percent correct ( there is no right or wrong way ) it depends on what your keeping imo💗👍✌️💯

Havent listened in a while but keep up the good work and the MTS brother!

KG Tropicals is John & Lisa. Prime Time Tropical is Jason & Joanna also with The small scape. Father Fish says don't use gravel or plastic plants, don't do water changes. I love these channel and your not far from them. Glass House Aquartics was in Florida this pass week, it would of been nice if you had met her.

There’s a reason I’ve been watching you channel for so long…

That the point 100%, also watch those videos. You need to do water change when in your tank only background and fish;) just wondering how long his fish ok with 80% water change.

No matter what I experiment on I always go back to a more natural way! It always seems easier plus they look more interesting and more of the natural way takes care of itself

Nano Vs. Cichlid Neolamprologus Multifasciatus, when worlds collide! Healthy debates bring better solutions. As long as there is no serious outrage, nothing but good things can come from conversations.

So unfortunate to have “drama” within the hobby for the sake of views. What you’re doing is obviously working for you and others and you’re not making videos telling people who use filters they’re terrible. This hobby is only where it is today because of passionate hobbyists being willing to learn from each other and try new approaches.

I like rivers better than lakes constant water changes. Plants do the same thing clean lakes up here in Minnesota . they both work same in your aquarium .

Best explanation yet! Thanks LRB.

Heck I keep hornwort in with a 175 gallon tank with sand bottom, 50 koi, fed twice daily, and I STILL don’t do water changes.

I'm on your side 😜 I like your natural style 🐠🎸

I just built a father fish tank 2 months ago and so far the tank is doing wonderfully and fish are reproducing. I’ve done no water changes. I just use some giant tweezers to arrange stuff aesthetically to my pleasing and scrub algae off the walls and it looks fine IMO.

Very well put. Keep doin ya thang !!!

Really interesting talk. "Many different methods" is a huge insight ... each person has to find/understand what works for his/her specifics .... big fish/small fish/planted/bare/breeding for profit/etc. Q: With limited water changes, how do you manage/avoid TDS creep?

I never really thought of it. Cichlid between nano interesting. I have both kinds of fish 45 tanks and I do water changes and I do not do water changes.

By far the best video I've seen from you. I have a green algae water 20 gallon tall tank with shrimp and ramshorn snails and live plants and just an air stone and my fish have been breeding a lot and I've never had to change my water and I rarely ever feed my shrimp but yet they are happily breeding.

Thank you!!!!! For the (keeping it fun) and real!!!!

I put leaf matter from the creek in my 20 gallon and I’ve been monitoring the fish closely and so far the only thing that’s happened is the dead plants disappear. I do worry about parasites down the road

I've been not gravel vacing my 10 gal shrimp tank to many babies lol but I do worry about not doing it ! Not even sure how I could to many plants and structures! I'll have to break down and do it down the road! It's a newer shrimp tank ! So scared to hurt the shrimp lol

I've been working a lot and have missed your live streams for quite some time. I'm soooo glad I ran across the recap of this one. It's just great! I only have 2 five year-0ld tanks right now. I rarely change water. I top them off. . I do check the water, it's always satisfactory. The only thing that's changed over the past year is that I have minimal algae growth compared to in the past. I turn my lighting up to maximum and run them eight hours a day. Oh well! Everything seems fine and I put algae tabs into both aquariums almost daily. Your videos are UBER helpful! bunches of thanks.

Appreciate you Lucas 👍 Those "dirty" tanks are far more impressive than any crystal clear co2 tank. Dirted tanks for life over here. Nothing better than good ol dirt. Mother Nature is undefeated

Thanks for the info. Being considerate of others opinions. 2 of my 3 tanks don’t need water changes.

You are my Fish Jesus and I appreciate it so much! You are my Marsh.

Ok il have a look. Imposible to keep for discus at those temperatures then as they need it much higher. Many thanks for your reply. I'm looking for cheaper// easier alternatives ;)

I did a water change lost a mated pair of 3yr old Angels...

I love your method. I’m using it for years. Do not worry about caveman or anybody else you do you❤

Thank you shrimp jebus. Everyone has their own version of truth. it's all about the beneficial bacterial. It's like the fight against good and evil. Asking as we keep neutral like our PH everything would be balanced. I noticed being too much of one thing is human growth regress. Edit: PS don't make shrimp jebus angry. Or his going to come at you with all his receipts. + His 1000's of fish videos. I think I know who I would listen too.

@lrbaquatics Lucas your tanks are beautiful clean and healthy. You never have to defend their clear & clean healthy water they all have. I was excited to meet both of them, the 3 of them in Aquashella Dallas next month but now I will just walk past them unless I decide to tell them how I feel about their dumb attacks on our natural tanks.

I'm with ya lrb ❤thanks for this ❤️

Its true, i keep fish for almost 15 years. At start i had dozen of filters on 1 tank at the time for the best water quality and did every 2 weeks 50% waterchange. I always had trouble with my water. Now i have a normal filter in my aquarium. Like 3-4 times the water volume per hour and thats it. I top my water off with new water just to fill it back up. I hold lots of Angelfish. BUT i do have good planted tanks. Never have problems with the water quality.

I keep nanos and cichlids smaller ones but oh and catfish and shrimp plus live cultures. I do occasional small water changes here and there I have some tanks that get none at all. They do well. I noticed the angelfish get cranky and start fighting after a water change even a small one and I play them some bach and vivaldi and they calm right down. I also don't feed much I used to but I am switching over to mostly live food that lasts in the tank so thats a good distraction for them they don't get bored and start picking fights so much. You have to develop a feel for the water and it takes some time. I am converting the entire downstairs of my house to a fishroom laundry is no longer a laundry, the garage is full of tanks the yard is full of ponds. I turned an old canoe into a ricefish pond. I am working on a real big pond in the front yard with rocks and lotus and lillies that will be my koi pond I might put some bigger native aussie fish in too. But I am doing a shallow area sheiled by rocks for small fish to get through and escape into aswell and a swamp to the side like a bog garden that connects to it. Have a plan for a stream and a bridge linking some ponds and to act as a sump for another project. Also in the future a greenhouse passive heating for more growout space.

i had to move a tank with 13 cichlids and almost lost them because of water change ...luckily they pulled through. but i keep and breed them in seasoned tanks with only top offs for more than a year now and they thrive using only two sponge filters

I have water setting around for days before I put it in. My biggest cichlids are only 6 inches at the most. 😊😅

Because I value your opinions, but especially for calling out a few of those "other" KZfaqrs, one of which (Neanderthal Man) doesn't know his a - - from a hole in the ground about fish keeping!!

For people who have a bunch of tanks ... say anything over 10 ... this could be helpful. I have evolved to thinking about "the fishroom" this way: YOU ... wearing hat #1... are the VIEWER/customer/enjoyer of a bunch of interesting fish and mini aquatic systems. YOU ... wearing hat #2 ... are the OWNER of a fish-keeping operation. (and/or shrimp and/or waterplant gardens etc.) YOU ... wearing hat #3 ... are the DESIGNER of a bunch of interrelated fish-keeping systems and environments. YOU ...wearing hat #4 ... are the OPERATIONS MANAGER for the facility. YOU ... wearing hat #5 ... are the FINANCE & BUDGET MANAGER for your faciity. Hats #2, 3, 4, and 5 are the MANAGEMENT positions. (If you subsidize your hobby with significant amounts of sales, you also have a Sales dept, a Sales Fulfilment dept, etc, which I am not going to discuss. But that adds additional functions and complexity to the organization.) Hat #6 belongs to the STAFF that does the maintenance and daily operations of this fishy empire. That is also YOU. In this capacity, you are (typically) UNPAID SLAVE LABOR. And it's your 2nd or 3rd or 4th job, if you are still in the working population and have family & kids, etc. if MGMT provides bad or seriously unfun systems, or the time commitment becomes too large, STAFF will be disincentivized from doing all the grunt work necessary to keep the place running well, and the VIEWER/ENJOYER will be disappointed in the experience. STAFF could revolt, or become unreliable in doing their tasks. Or walk off the job entirely. If you have been in the hobby for a while, you're seen people become over-extended and burn out. Perhaps you've done it yourself. It's MGMT's job to treat the staff well, and provide thoughtful, workable systems within the capabilities of the team. D.O. Y.O.U.R. J.O.B. !!!! Your staff will thank you. And stick around for the long haul. Nobody likes working for an abusive boss with unreasonable demands. (Edit/add:) Pogo said: "We have met the enemy, and he is us." Low maintenance systems make your hobby effort more sustainable. If the maintenance burden per tank is less, you can have more fish (if you have the space), which pleases the Viewer and the Owner. It's the way to go ... IF ... and it's a BIG IF ... it's viable for the kinds of fish, and the scope of the breeding/grow-out things, you want to have/do. HTH. TLDR? Sorry.

"Ya filthy animal! Grrrrgh!!" 😂😅🤣😂😄😁😅😊🤣😂😅🙃😇🤣

Just ignore the ignorance from Caveguy, he clearly has limited experience with fish-keeping other than maybe keeping Cichlids for a few years and trying to create a YT job. Guys like that buy 2FX6's and a 125 and most of the time they quit after a large tank crash after 2-3 years at most because of a bad water change, people who stay in the hobby 20-30 years are the ones who breed and also own "dirty" tanks. Even at 14 yrs old I was able to breed all sorts of fish and changed my water 1 time a month 10-20% maybe.

Do you have any video about goldfish filterless tanks? Also how do you keep the temperature in the filterless tanks? Do they still have heaters? As a heater is the most expensive bit to run in a tank....