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It's a pond snail/bladder snail. Unlikely to overpopulate if you are careful to not overfeed. You can remove it if you want, but chances are, you already have one or more egg sacs in the tank. LOL.
Some see them as a blessing, others see them as a curse. I like them, they don't eat plants and they really don't explode in population if you keep the feeding in check.