I am a newbie grower with two harvests under my belt. I am growing in 4x4 trays using rocks and rockwool cubes under 1000's MH/HPS on a ebb and flow system. I have a 2-65 gallon resevoirs feeding 4- 4x4 trays.
I use 4" cubes and set them on top of the rocks and feed 8 times per day to just...