The only thing I can say is, EMERALD CRABS!!! My hair algae was getting out of control, I only have a 29 gallon, and lots of hermits, which hardly touch the stuff, and the day I put in my emerald, the stuff started disappearing! He has completly cleared on of my live rocks of the stuff! He gets into places that I never dreamed he could, and he doesn't even look twice at my mushrooms!