Hi all,I was looking at the CPD in this photo, before I read the rest of your post, and thinking that it looks really malnourished, to the extent I would suspect internal parasites.
Parasites? I hope not.
They might be getting out competed at feeding time, but the CPD seem happy to feed from the surface.
I'm feeding them micro pellets, crushed up flakes and crushed up blood worms. Maybe something that sinks quickly would be better?