If you don’t come up with a better solution, then here is a thought.
Remove your corals to a holding tank and dose the display tank with a standard dose of chloroquine phosphate. Just one dose will wipe out your entire snail population. I know because I treated a case of ich this way before. Snails went quick. It took a few weeks after before I could keep snails again. I deplore vermetid snails. Their webs and cones are unsightly. If I ever get a case of these, I won’t hesitate one bit to nuke them this way. The tank will recover in short order and the corals will make it in a holding tank for a few weeks.
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