Anyone use this product? The planted aquarium forums say it's great, and It's been recommended to me as a soil additive. I've got Moltan 7941 Universal Absorbent to use if I want it. What would it replace in a soil grow? Rock dust? Or does rock dust offer more than just a home for mycos? Could it be used by itself as a hydro media like coco or hydroton? I'm using Kellog's Patio Plus and was going to add more perlite and maybe this clay stuff. Thanks!