is this aiptasia

does it have a green center when you are only running your actinics?

I have one too - a hitch hiker, it now has another head and it has eaten my shrimp and a fish

been wondering the same thing myself.
 
not aptasia for sure, but it maybe a rock anemone. how big is it? does it move on the rock or do it stay in the exact same place?
 
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