two months ago i purchased some beutiful green zoanthids. they have grown and spread like crazy, but in the last couple of weeks they have started turning brown around the edges. it started with only one polyp, and now has spread to all but one or two. they still seem to be healthy and expanding well. is this something normal for zoanthids to do occasionly? will they get there color back eventually? here is a pic shortly after i first purchased them. they look a little brown around the edges in this pic. but, that was just how the picture turned out. my daylights just went out for the night. so, i will get a current pic tommorrow.