What kind of snail can I put in this tank?

I have a mystery snail. They come in light yellowy tan, dark brown and this grayish blue. The ones that i know of, the colors listed are black mystery snails, just plain mystery snails (yellowy tan) , and blue mystery snails. I say these are the best kind. I have a plain mystery snail and a black mystery snail. Really all you do is put them in your tank and they do their thing ;) All i do for mine is once it gets s on it i clean it with a toothbrush. I do this by bringing it out into the air then hold the sides and scrub him-you may want to do it with a clean toothbrush or have one just for your snail/fish tank. Taking them out of the water is ok as long as its not for a long time. I take mine out to scrub for about a min.