I have a bakpak 2 skimmer and I was wondering if I could put some of that chelo stuff in the return chamber? I would have to put a grate at the top so it wouldn't flow back into the tank though. I think you all refer to the stuff at chelo, but let me describe. It's the green stringie stuff that you can put in a sump or such to help with nitrates. I just bought a bottle of copepods and that stuff is in the bottle.