Just seeing what people might think these are. I'm assuming aiptasia, and the pic isn't very good. They are all over the tank and small, like 1 or 2 mm for the most part. I was cycling the tank and had a phytoplankton bloom due to using old sand, and when the phytoplankton finally cleared up (a few months later) these were all over the 75 gallon. I don't mind if they are, just curious of anyone can definitively tell at this size.