mystery snail

Don't worry with it, they're cool hitchikers.... just some sort of turbo cousins or something... I've tons in my tank and they keep living so maybe they reproduce easily in captivity?

I've got the same thing. They're definitely a breeding population in my aquarium, and they only really come out in force at night. They do such a good job cleaning up that I had to get rid of my two largest snails because they were starving.