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Are they bad?Vermetid snails. You can crush them to eliminate them. They’re usually a byproduct of too many nutrients in the water column
They can bother the corals. They can also break off under your skin of you grab/poke one accidentally. They are often found in newer systems, and once things are nice a stable tend to die off on their own. The tube, however, will remain. Carefully breaking them off at the base will do the trick.
Those things have sliced me open like a scalpel before, oh poking them is like taking a core sample from your finger, there's a hole left.