I put in a nice star polyp last tuesday, and need some advice on acclimation. It opened up very nicely at first, but now every day since has been showing less and less polyps. I have it low in my tank, in a nice flow, and under PC lighting. My water quality is good, although I'm due for a water change, but that shouldn't hurt anything... Anyway, should I move it higher in the tank? Is it closing up because it requires more light?