It is like a DWC. The plants them selves are in a 1.5 inch piece of Grodan. And that is in a 3inch net pot. the roots are hanging out of the bottom of the pots. I try to keep the water level just below the pot. Right now I am flushing them. Do you suggest using the nutes at maybe quarter strength? I am going to use the combination of FF nutes Grow Big Big Bloom and Tiger Bloom as per the schedule they have. And try to keep the water level just below the pots. Before I flushed them I could see alot of white buildup on the hydroton, could it be sulfur buildup? I use distilled water, ph'd to right about 6.