Caught these on two seperate zoa colonies in different areas of my tank at night.they could be on other coral as well. They just stand out against the closed zoas. they colonies in questtion are growing fine and are open in the day. So I'm not sure there hurting them. Might just be using them as a home. They are tiny.like crazy tiny. This vid was shot in a shot glass on a paper towel. My galaxys3 wwas zoomed all the way in. we are talking smaller than a flea easy. Tiny! Seem to be a crustation of some sort. And have trouble standing upright on the glass. Anyone?