It does sound like collonista snails to me as well. My 110 has thousands I'm guessing. I find them very helpful in algae control. In fact, I'm down to 2 turbos, 1 astrea and a few cerinth and nassarius for stocked snails and I'm not having much issue with algae.
I think of them as my free midnight cleanup crew, as they mostly stay hidden during the day.
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