Looks like Colonial hydroids.
You can take the colony out and in a separate container of tank water, scrub them off with a toothbrush. Rinse them in a separate container of tank water too.
Just note they may come back.
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Bill
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."
B.B.
Current Tank Info: "Still" Living vicariously through cb747
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