I read the sticky on mineralized topsoil. Sounds like mineralized topsoil works great but I dont want to layer a substrate. I also think it would be to powdery. Just one simple substrate that can be stirred up and cleaned once in a while.
I did have a thought about the mineralized topsoil. Say after you made the slurry with the clay, you laid it out on a cookie sheet ant let it dry and harden, or bake it for that matter, Then broke it up with a hammer or something into gravel. Would that stuff just turn into the slurry again when left in the tank for a while? Would the plants get the nutrients out of it still?
Does the flourite black sand compact a lot? When you clean it do you siphon it like normal gravel? What about the onyx sand? Is it just as sandy as the black sand or bigger grains?
What is the difference between EC and Flourite?