Hey, I am new to this website and thought these forums would help me with my reef questions. Well, I decided to try corals for the 1st time, went to the store and bought what I believe are button Polyps. They were bright green in the middle w/ brown edges. Got home, put them in tank and the green in the middle is going away. Today, there is only a spec of green, if that. they are all brown!!! Are they dying or is this normal? It looks very drab in my tank w. this brown creature in it. Thanks for any help!