Green Bubbles

drummerboy

Member
When I first purchased my live rock there was a piece with a small green translucent bubble on it. Over about three months it's consistently grown in size (though still not over 1/4 of an inch in diameter). Now it is growing a few smaller bubbles underneath it, and another spot on the rock has grow two more. I've seen bubble algea, and I'm almost positive this isn't it. Anyone have any ideas? Is it a type of coral?
 
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