I have been having some on going issues with my tank that I can't identify. Parameters are all well within the normal range so I think I must have something in the system somewhere that is causing problems. What would make corals in the pocilloporidae family like s.calliendrum and other similar species that look fine with polyps extended but the polyps actually "blow off" leaving bare white skeleton when I use a turkey baster to blow the "dust" off the base rock and accidently blast the coral? I've never seen anything like this and it's driving me crazy!