In my community tank I have flake eaters and bottom eaters. My bottom eaters are corys a plec and my 2 new goby dragons. No problems with the corys and pleco, but the gobys eat mainly bloodworm, frozen shrimps and things like that. They don't like flakes. I try to feed everyone at the same time, but every time I put bloodworm or shrimps in, the flake eaters finish it before it has time to sink and I'm left with floating flakes and hungry gobys. How do I solve this problem?