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Annie's right, it sounds like a stomatella (aka "cap") snail. Harmless, and will reproduce in our tanks. The largest ones I've seen get to be about 3/4" long, including an about 3/8" "tail" that they can actually shed if attacked (like a lizard). Smallest ones I've seen in my tanks are well under 1/8" long.
Kevin
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Back in the pool, swimming with the sharks...
Current Tank Info: Red Sea 425XL w/Kessil AP700, Vertex 180i Skimmer, 2 x Vortech MP40s
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