Cali Kid Corals

anyone able to ID this sucker?

This guy came into my tank along with the bag of sand (at least i thought it did) when I moved my old leaky tank out and into my tank's new home.
There's a lot more life now that the tank isn't filled with ammonia leaching silicon.


 
Nudibranch.
How big is it?
It looks like 1/2 inch from here.
This kind eats montiporas it's about 3/16 inch long
Corals5-09046-1-1.jpg
 
that thing is about 1/4 inch right now -- is it a danger in the tank? I haven't seen it affect the tank at all, I did have some strange growing stuff since, but nothing much so far.
 
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