What is this?
 

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I have a few of these little anenome type creatures growing in my tank. They are getting bigger each week. How do I get rid of them? I'm afraid they are going to kill my sps corals and take over the tank. Any suggestions?

Aptaisia. Not something you want. Search for the term, tons of threads over the years on dealing with them. Check my spelling first -lol

Thank you, looked up some info and took the affected pieces out and burned the little buggers away! Fingers crossed, hope I've got them all.

Not a common solution, but burning will work :)

peppermint shrimp work well