Hi, yea I have 1 emerald crab, & turbo snails, but they can't seem to keep up with it or they stay in one spot..I have one piece of rock that is squeaky clean! Any other critters I can add? Maybe I need more snails, I got 4 turbos in a 15 gallon, and what kind of snails to add? My other 15 gallon is hair algae free..go figure?? Thanks for any help.