The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
Looks like a mystery snail to me. Here's a pic of one of my blue ones, excuse her damaged shell, she got out of the 46g tank & one of my dogs got her before I knew it. This was a week or so ago, her shell is almost completely re grown. They can get pretty big, I have a black one thats at least golf ball sized.