i have three that are about that size. i had no idea snails could get that big until I saw some at the lfs, and I just had to have some! they usually stay in the rocks during the day, but at night they all get on the glass. very cool
thats crazy, well this morning i don't see my big turbo snail anywhere...but he is huge to be disappear..well i checked the floor and around the tank and i don't think he crawl out. This is a weird mystery to my tank..ek can he be under the sand?