Grain size is pretty small, gets stirred up pretty easily, so that's one of the downsides. But it settles back down pretty fast, so I can live with it. I just have to turn off the filter whenever I work on anything inside the tank (moving decorations, planting plants, removing turtles/fish, etc), cause I hate when sand gets stuck in my filters.Sweet. I like the color of it not to mention the price. What's the grain size like?