So now i have some green algae growing in my sump, theirs also some purple, and clear type algae growing. What cuc should i place down in the sump to give it a good cleaning. Right now i have 1 blue leg crab, and about 7 snails in there. I'm starting to get brown algae in the display tank also. What will remove the brown algae. Becuase all of my CUC seem to not like eating brown algae!! help thanks