Two years ago I got a tiny torch coral that had hitchhiked on a piece of live rock. It is a beautiful flourescent green w/white tips. It has grown huge (fragged once) about 7-8 inches when fully open. Today I noticed this dark brown mucus looking substance coming from one of the heads of it. I tried to siphon it out but it just disingrated..then I noticed more come out. Any thoughts on what this could be??