Do you clean this as you would sand by keeping the vacuum up above it or like gravel where you put the siphon directly into it? Does the fish waste sit on top as it would on sand, or does it fall into the substrate like it would on gravel? Does anyone know how it compares to the same brand but in the peace river substrate? That's what I currently have and I wanted to switch to sand to try to cut down on nitrates. Thanks so much!!