As you can see in the picture I'm currently going through the diatom phase of a new tank and it's almost over. Alot of it is dying off and the inevitable happened earlier than I thought it would but it happened. Somehow I got pond snails probably from the new giant hair grass I got. As I was looking at my aquarium today I noticed all these clean trails on the rocks and sure enough I followed them and they lead me to two pond snails. But I mean just look how good these little guys can eat the diatoms. My 1-1.5 inch mystery snails can't even keep up with how much these tiny guys eat!