Hopefully I can get a positive ID on it.
I sure hope you are just kidding. There could be pockets of water inside the rock that could cause a big bang in the microwave or when taken out to let cool.lol microwave~!
Yes, aiptasia do move around...if it moved like that it makes me think it's some sort of anemone. I don't recall any Aiptasia moving around the tank IME.