Thanks for the interest. I'll include some suggestions for simple DIY medaka stuff in my next video.

Sorry for the late reply. I'm not sure about latitude but the climate is "humid sub-tropical". E.g. similar to central Florida, Hawaii, southern Japan etc.

Sorry I have to say "it depends ...". For my tough medaka, generally, water changes ............ a heated tub with juveniles and sponge filter, about 10% once a week or so ....... a bucket with newly hatched fry, no water changes for first 2 weeks, after that perhaps 20% about once a week ..... container with eggs, probably no water changes. For my more delicate medaka ..... a more careful approach because higher risk of failure to produce viable fry (when I get some eggs I'll perhaps try to demonstrate in a video). Water change method for small fry in a bucket (to reduce sudden water change) ..... usually syphoning out through a 6mm aquarium airline tube with a piece of gauze over the end to prevent sucking up fry. Adding fresh water by syphoning in through 6mm aquarium airline tube using drip acclimation technique (see youtube for drip acclimation for shrimp). If you want to make an early start, I suggest your indoor medaka may probably produce eggs at temperatures over 20degC and with 12 to 14 hours of lighting.

This is super helpful. Thank you!