Any clue what this is?

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kdpuffer

Aquarium Advice Addict
Joined
May 8, 2011
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Alberta canada
I first noticed this in my tank about a month ago, It just popped up on a piece of my original live rock. It's the dark green thing, almost looks like some sort of plant sprouting. It is squishy and it is growing.
 

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Wow, I think that might be a new one! Can you snap another shot of it with light on it or something for a better view of it? Kinda reminds me of a mermaid fan, just not fully developed.
 
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