lol nothing just to have enough tank size when they are full grown like each fish should have the correct amount of sapce when full grown but it didnt say the size, I am sure you can calcultate it by the length and width when they are full grown. Another thing you can try is to look up another fish that is closely related to it or in the same type of fish and see how to breed them it may be similar but I am not positive, just a thought.