I've had great success getting rid of them by starving them out - I switched to feeding floating pellet food instead of mysis and other meaty foods that sink in the water column. I would drop a pinch of pellets, wait for it to be eaten, then repeat as needed. About a month later I have mostly empty tubes. I also superglued the larger snails when I found them, and scraped smaller ones where possible. Now I have zero that I can find.
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