turbos don't last very long they just don't seem to do well in captivity, I prefer nerites as they tend to thrive ,they do almost the same job as a turbo just a hardier snail
nerites yes there is a fresh water species
theres also a salt water species
looking again of the snail pictured could be a virgin nerite also sold as turbo's
actually the foot on that snail is torn from being pulled away from a object it was attached,
over time I think it will grow back just fine , otherwise looks healthy to me must be happy he's climbing the glass. I'm thinking it may have happen when he was pulled off either a rock or even the glass with force when you bought them .