Personally, I don't see why people try growing some plants anyway. Sure, if you're planning for the end of the world, or have lots of outside growing space, that's one thing. But, until the end comes, it just seems like a waste to grow things like potatoes, cabbage or corn. The first two are simply dirt cheap, and corn's yield is low, compared to the space & nutrients that it takes. It just seems like a waste of greenhouse space. The real issue that I see with aquaponics is that there's an abundance of nitrogen, but a shortage of some nutrients like potassium. Depending upon ground water components, calcium & iron could be in short supply also. The big problem I have is that there are too many people acting like experts on hydroponics...but they are really just home experimenters. They spew "gospel", but it's often just their guess.

+Justgivemethetruth Are you going to eat those greens in a salad or will you juice them? Juicing gives you super concentrated nutrition in a glass but it takes a lot more greens than what we would normally eat in a day. That's because juicing removes almost all the fiber and fiber makes your tummy feel full (fiber is also great for elimination and being "regular" and I think it helps to detox as well). So you have to answer that question first. I'll assume you're going to eat salads, sandwiches or soup. I love to put spinach or kale in soups and stews to give it some color and also punch up the nutrition value. It also depends on how much you love to eat greens so take the following with a grain of salt. You'll want variety so you'd have to grow adriana lettuce, black seeded simpson lettuce, spinach, celery, romaine lettuce, arugula, pak choi (or tatsoi or bak choi) and swiss chard is my guess. This will give you a wide selection to choose from and you'll probably want to use the "cut and come again" method of cutting off the outer leaves while leaving the rest to continue to grow more leaves. I haven't seen all of bobby's videos but in the later ones he doesn't seem to have any tatsoi growing. I don't know if it didn't do well in the kratky floating raft setup or what happened. Bobby has 12 head of adriana lettuce in a 3x4 kratky floating setup. At about 3:30 in the video he talks about having both adriana and tatsoi -- by my count 30 plants in a 4x8 kratky setup. The Pak choi should be in its own 3x4 as should the swiss chard as these are heavier feeders and swiss chard will get huge if you let it. I doubt you'd get 12 swiss chard in a 3x4 setup. My guess is closer to 9... but you won't want to eat the chard every day in all likelihood so one box would probably suffice. I think the kale might grow better in either a dutch bucket (2 plants per bucket) or an NFT system like the one Bobby shows in another video. Remember that he is showing how large the plants will get after 30 days (45 in the winter) so he's not cutting off any leaves during that time. If you cut off enough for a nice big salad with some really good variety in it then your plants won't get as large and you might even be able to fit more plants into each box. For 1 person it looks like you'll need at least 5 of the 3x4 boxes plus another 1 or 2 of the 4x8 boxes. And you'll need a seed germination area (Bobby has a video on this). It takes about 2 weeks to get from a seed to a plant with enough roots to go into the kratky setup so you will want to calculate the size of your germination station with that in mind. If it were me I'd plant only 1 or 2 plants of each variety per day and start your seeds the same way, 1 or 2 plants of each variety per day. And of course wait a day between starting new seeds. If you did then 12 plants in a 3x4 would feed you all month, assuming you didn't want the same variety every day. Consider a scenario like this: every Monday is adriana + spinach + celery, Tuesdays are Romaine + arugula + pak choi, and Wednesdays are swiss chard + black seeded simpson + tatsoi. Then you'd have to decide if you want tomatoes, cucumbers, bell peppers, squash or melons in a separate dutch bucket setup. Succession planting of each of these should provide plenty of vegetables, possibly year round depending on where you live and whether you are going to heat your greenhouse or not. Hope this was helpful to someone.