Well alot of people are Gona tell you you'll need 1 every 55g. But I had 20 in a 29g they had babies often. You'll just need ALOT of hiding spots and a temp of 78-82°. A good filtration. And I feed mine hikari carnivore pellets. And each one would come out and take a pellets and go right back in there huffing spots. Know I have them in my sumps to keep the bottoms clean and they don't seem to mind and they still have babies. In there but they get pumped In to the tank so the babies get eatin.