I had planned on filling 1 gallon round black pots with hydroton. 11 in a 3x3 under a 600. I don't want to use rockwool, lack of funding and I just can't see how so many people are successful with it, doesn't seem like it drains fast enough, and it's alot more to dispose of, the last ones the biggest one for me.
Oh and the biggest biggest is not being able to move the plants, I have no light mover and don't they have to be rotated or they'll grow funny?