Hello everyone, I purchased a piece of live rock a week ago. This rock contains a 2 inch circle of white star polyps. They just do not seem to want to open. I have performed a water test and they numbers are all good. All of my other corals are open, and my fish are doing well. Is this normal? I am running 4 - 48" flourecent bulbs(2 actinic, and 2 plant bulbs). Does anyone know how long it may take them to open. ???