What do they look like? Pyramidellid snails are parasitic; you would find them on bigger snails or clams. Rissoids are harmless, and look a lot like Pyramidellids, do a Google to figure out the difference. Sundial snails are parasitic to Zoanthids and and a little pyramid-shaped trapdoor cover over the opening of their shell when they suck themselves in. Collonista snails look a bit like Sundial, but are harmless and related to Turbo snails.
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