okay, so I went to petco yesterday, and picked up a ramshorn snail for tank, since they were on sale, and I though, "eh, why not?" well, I bought him and took him home and I floated him for a bit, then plopped him in, and he started crawling around, you know, doing snaily things. then, out of nowhere, he started digging into the gravel. now this was very odd to me, as it has never been mentioned to me that RHS are burrowers. and you know what? after he got about 2 inches down, he popped back up, with an old, decaying algae disc my pleco had buried a long time ago! he then proceeded to eat it. wow, they must have a very good sense of smell! have you seen your snails doing similar things?