#2 djembekah User Aquariums it seems like you do not have the space to breed much other than live bearers. 10 gallon is not a big enough grow out tank for a lot of things, and 29 is not really big enough to hold a lot of cool fish. and i would expect the crayfish to eat fry. if you DO pick a kind of fish to breed, find out what is necessary for breeding. a lot of things need like 40 gallon breeder tanks