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I've got a mat type coral. It has a red base with bright green polyps. I noticed a few white, cotton looking things about the size of a pea on it while I was doing a water change. Normally, one wouldn't be able to see the things but all the polyps retracted and there they were. I knocked one...

I received a 45 gallon reef tank from a friend who was moving about a month ago. It is my first reef, I only had pure fish tanks before. On the glass I noticed many small critters about the size of fine sand on the tank walls slowly moving around about a week after getting it. Now, three...