HELP!!! I have a real problem with what I would say are rock anemones. They have reproduced from one that was a hitchiker to maybe as many as 20 or 30. I think they are killing my bubble tip they have eliminated zenea. They are completely taking the tank over. Can they pollute the water to slowly kill things off? HOW DO I GET RID OF THEM? THey are about the size of a silver dollar green in color and have sticky edges about 1/2" long tenecles with a center feeding mouth. They really have stuck in the rocks and have stayed in a group about 10" by 5" wide. please help. I'm thinking about removing my rocks and replacing it with new, but wow there still are som good things on them too.