My bubble coral which I have had for a couple days now looks like it is doing graet, however ever once in a while a part of it closes up - opens its mouth and releases a stringy redish - maroonish material. They are not feeding tenticales as it is actualy released into the water - what is that? Is my coral sick? another thought is I do use red cycloeeze to feed my fish - think it has anything to do with it? thanks!