Tried rockwoll and hated it. Here is what I do. I fill a 6" net pot half way up with hydroten then I take a small pvc cylinder about 1" 1/2 wide and 1" deep place it center in net pot fill it with Vermiculite 1/2way put my seed in cover with vermiculite flush with top of cylinder and water with 5.8 Phd. Sucess every time!

Peace :stoned: