I use sugar fine.... that's as fine as I will go. I don't know the size off hand but it's not 0.125mm. I had such trouble with that stuff. I forget exactly what happened, but the flow changed and my plate got completely covered. It never recovered. When I set of the 28 gallon SPS nano I'm thinking of "gluing" substrate on there so it can be blown around in the high flow environment.
I'll use a remote
DSB if I need/want to go that route.
