They will probably be eaten soon, you may want to catch them. I raised mine in a really fine net, suspended over the tank. When they got to big for that I got a tank divider. You could always buy another tank. I don't like breeding traps though, I kept losing them.
For feeding I use tetra baby powder, pets at home sell it and its great in my opinion. I've heard food like liquifry can pollute the tank.