This one should be pretty easy for most of you. I got a colony of green button polyps about three weeks ago and cant seem to figure out what part of the tank they like most. I have a 54 gal. corner tank with a coralife dual 65w bulb with one being a 50/50 and the other all atinic. In the rear corner I have a pendant syle coralife 175 MH with 10,000 k bulb. Problem is when I have something near the front of the tank it mostly enjoys to compact fl. bulbs. If I put something up higher near the rear it get a good blast of metal Halide. My button polys originally were more toward the front. They seem to open themselves up too much. They really spread out and no longer have any cup shape and all, in fact they seem to open backward a little. I figured maybe they needed more light so I moved them into a prime spot closer the the halide. They still are the same way. Does anyone know why this is? They have what I would call medium to strong water movement. Maybe more toward medium I suppose.