ok, here is another issue I am wondering about. For abtou a month now I have had a rock with about 15-20 green mushroom polyps on it with the size range form .25 to 1.5" wide when fully opened. They looked ok when I brought them home from the pet store but then shortly after they looked great and were really big and looking healhy for about a week. Then they just shrank up and have not ever expanded much since then. They are not dying and nothing in the tank has changed. All other corals are doing great except this one. Parameters are fine and the coral gets medium flow and good lighting. what makes me wonder is that all of the poylps are looking sad not just a few. I bought this coral becuase of the ease of care, am I missing somthing? I feed every other day either dt's or marine snow and everything else is doing fine on that diet.