We had a couple just like that, only pure white. The tentacles retracted in the daylight. After a lot of resaearch I found out it was a type of sponge...I'll see if I can dig up the name. Yours might be the same... but we've had them for a year, and they're nothing but cute! Good stuff to have, I think
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125 gallon 6', 33 gallon sump \ refugium
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