I agree with the Nerite Snails too. They are very cool. They come in some interesting shell patterns. The only down side to them (if you consider it a down side) is that they will lay eggs on the glass of your aquarium. But the eggs won't hatch so you don't have to worry about snail over population. The eggs can be scraped off the glass if they bother you...I leave mine on the glass...I think it is kinda neat.
