If so, it will have the thin disc for an operculum rather than a thick operculum made of shell material. They are algae eaters, of course. Although they can grow to almost 150mm, the average adult is from 75 to 100mm. Still a large snail, but two of them should be OK in a tank larger than about 200 liters, I think.
It has to have a lid of one sort or another, either a disc or a lozenge-shaped glob of shell material. If you take the snail out of the tank and make it withdraw completely, you will see the operculum.
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