shnkrmn Well-Known Member Jun 4, 2010 #2 perlite retains a little too much water but you can use it. There's also coco. some folks use lava rocks. CAP has this new inert medium called STG but the reviews are mixed.
perlite retains a little too much water but you can use it. There's also coco. some folks use lava rocks. CAP has this new inert medium called STG but the reviews are mixed.
