The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Its aiptasia... it will spread like wildfires. Get some aiptasia-x from your lfs to get rid of it... if you try to remove it by hand then it will spread seeds all over your tank... also it will sting any coral or fish that comes in contact with it