For the male and female to be comfy whith each otgher till she berrys up I would say a 29g or better with loads of caves and hiding. Once she berrys up you will want a seperate tank for the male(mine went nuts and kept trying to attack her while she was berried up, opportune critters they are). Once the babys are born ya will hafto watch momma as some mommas will just eat them all I got lucky and mine ignores them. When she was about 3 inches she had a little over 100 babys she is about 5 inches now and it seems between 2 and 300.