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Don't move and when I tried to move it it came off in one piece. When I zoomed in I could see little bug type things moving around it. Coral looks fine now it has come off. Could this still be a flatworm as it was hard and didn't move but fell into a whole in my live rock.
No shell. Came off in one piece.hard to tell, but looks like some type of flatworm. Does it have a shell?
Thanks for the advice. Still a newbie to this but having a great time.Wasn't moving and came off as a chunk is probably still sponge in my book - maybe you have a magnifier and can look at the texture in a bit more detail to try and confirm. The little bugs look like amphipods or other small beneficial pods and are scavenging - not something to be worried about.

