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Oooh.. yea it does look like a coral top especially when it's not pulsing. So a hydroid? What would that be lolI believe it is some type of hydroid. I have thousands of them in one of my tanks. They start out looking like a tiny anemone then will begin to morph and then detach from the base. They never last too long in my system in this planktonic phase before the sump eats them. I do get some from time to time that will be larger than a pencil eraser.

