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Might also be colonial hydroids, though it is somewhat hard to tell from the image. Vermetid snails (worm snails) have a curled base. Colonial hydroids do not.vermited worms
How to get rid of it?
Yea. Those aren’t good. I’ve had them. I’ve had pretty good sucess just putting putty on them though.
They are filter feeders , and I feed NPS and bivalves. But still managed to contain them.