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Hard to tell from the pictures, it could be vermetid snails, or feather duster worms?
The new pics look like feather duster tubes and a few spirorbid worm tubes (the little white spirals) to me - both of these are harmless filter feeders.
I know some people will scrub the shells with a toothbrush; some very carefully scrub suspect snail shells with hydrogen peroxide (I want to say most people use a Q-Tip for this, but I can’t recall for certain at the moment), then rinse them off before adding them; and some do both.Awesome. Thank you. While I got you- do you take any measures to clean snails shells? I think I saw aphasia in a tank that the lfs gave me a conch out of. Kinda nervous to put it in the tank.
I know some people will scrub the shells with a toothbrush; some very carefully scrub suspect snail shells with hydrogen peroxide (I want to say most people use a Q-Tip for this, but I can’t recall for certain at the moment), then rinse them off before adding them; and some do both.
Some people also do a full 72-76 day fishless quarantine to ensure absolutely no fish diseases enter with the inverts and so they can monitor and see if there are any pests (like Aiptasia or bubble algae) on the snails.

