I just bought a FF culture. It's really booming with flies, but I have a few questions. Along with the FF culture I bought a turquoise auratus, and it's very small, and in a 20 long tank. I tried feeding it but it seems to just ignore them. Should I wait for the PDf to settle in or is something wrong? I read on something about keeping them in a sweater box and feeding there and keeping them there until they're larger. Is this true or necessary? Thanks.