They all live in a 20 high, with 3 adult guppies, a female betta, and 6 ghost shrimp. I feed flakes 5 times a week 1x per day and frozen bloodworms the other 2 days also once a day. I don't believe feeding is the problem because they all plump up fairly well from feeding, even the little ones. And as I said before there are 5 teeny ones. Also I should add that there are 9 that are growing well. Down quite a bit from the 72 I had when they were first born but that's why my betta is there.
Oh by the way what could I get to help my betta keep the numbers down? I know my tank is already overstocked but all of these babies except 3 will be moved to new homes in the next few weeks, and I don't want to keep having to deal with finding homes for fish, the only LFS near me is not a good one unfortunatly and I do not want to give them any of my fish. So is there anything I could add to the tank that will get along well with the female betta?