Join Date: Nov 2014
Location: Central Coast CA
So, heres what i did with my flourite sand.
I drained the tank and took it outside. Flipped it up on its side at a 45 degree angle and ran the garden hose into the tank. With the hose on full blast, you can push the end down under the substrate and "fluidize" it. Careful to not blast the substrate out. Moving the hose around through the substrate, it rinsed clean in less than five minutes. Voila, no dusty tank.
I don't know if this is an option for you, but it worked really nice for me.