Looks like you have some used live rock. Someone had a colony there. That was moved, and the tissue remained. You will get a good idea what it is if it takes off, tissue remains like that will spread till they have a large enough base to explode up. Then you will have a better idea what it is. But for now, id stick with the green porties.. but it so hard to tell till it goes up.
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In today's world of nearly instant everything and what is exceptional today is only par tomorrow. My Reef is the only place where I must wait, and do so with glee.
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