Whats on my live rock?

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The forth pic is aiptasia, pest anemone which can spread over tank but can get some stuff to kill it or get few peppermint shrimps to get rid of it
 
That's what I thought. Thanks.
Any I idea what the white fuzzy stuff is?
 
I had some of that red moss in my 40 reef. Stuff was a bxxxx to get rid of. Nothing i seemed to do would get rid of it. Finally got rid of it by assorted snails and lastly my yellow tang tore that stuff up. Found out it was growing in my refugium and passing threw the pumps into the tank. Piece of screen solved that.
 
Great. I got some crabs in the now. They are all over it. I just found something else. Can't really see it I just see tentacles
 
The pinkish purple is the good stuff. Coraline algae is what it's called. Over time that stuff will be everywhere. The other pictures I think looks like a baby brittle star. If that's the case then no dont get rid of it. There good cleaners.
 
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