Burks

I have some of this in a 14g hex that only has Ghost Shrimp in it. After a few days the water was clear but the substrate still moved even with just the brush of a shrimp. Fast forward about 10 days, the substrate barely moves now and is a bit softer.

Take it for what it is worth.

dawntwister

If you can't it to work try river sand. I just sifted it and put it in the tank. Cost only $3 from landscaper.