I bought this 12g nanocube tank yesterday, it was very dirty, did a water change and good cleaning of all media and walls, it looked as if it wasn't cleaned in months. In the tank is this overgrown Zoa of some type (I think . . I'm just starting corals), it looks as if some branchy leather corals as wrll., Not sure. I found there was a living damsel in there as well. When I cleaned the media, there were a bunch of what I believe to be as bristle worms. The reason I bought it was to learn fragging, and practice. Suggestions on what this type of coral could be, what to do with this tank, and will this damsel be ok? I need to check the parameters tonight, as cleaning it took a long time. Please help !