I bought 2 white mollies. They were pregnant when I bought them. That's why I wanted them. I've been trying to breed mollies for almost 2 years now with no luck. I just thought it would be better if I would buy pregnant female and raise the fry. I put the mother in one of those plastic birthing boxes and the other in a 2.5gal tank. The one in the plastic box gave birth first. I switched the fry to the 2.5 gal and removed the other pregnant female to the birthing box to have her fry. Well, the first mother that gavebirth got pop eye and died. The second mother gave birth and is still living. I returned the died mother, since is was a week garrentee, and got two more pregnant females. I came home today to find that one has given birth. I took her out of the birthing box and put the other in. All the fry are in a 2.5gal and will be up graded as soon as I can. I went to get 4 (20gals) Is this enough tanks? I don't know how many fry there is. They don't exactly stay still for counting.