Okay, so I believe these guys are ramshorns (correct me if they aren't). I thought it was just the one, but this morning I found another. I was willing to let the one live in my tank, but now there's two (maybe more) and I'd really like to avoid a snail explosions (there are no predators in my tank). I hate to kill them and I certainly won't release them into the natural waterways. My logical brain says it's these two or tons more later... Guess I'm just looking for option three? Any suggestions.