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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.
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.