Or like my own tanks, do not even use the powersand or the other stuff, just use ADA aqua soil. Works the same.
I did use a mesh bag full of lava rock but mostly so I could create a hill without adding 2x 9 liter ADA AS bags, but this is just to reduce the volume needed, not for any reasons ADA list. Since the lava is in a mesh bag, the aqua soil will not mix with it and look tacky and mixed together like Fly guano and ground pepper. Hard to pick out then or if you uproot anything or if the slope moves etc.