I have 3 mediums to try. Promix HP-CC, Promix HP-M, and B'cuzz Hydromix HP.
I'm going to try using between 1.5 and 2 gallons of mix in the 3 gallon pots and transfer from there to the 5 gallons.
The feeding method the guy at the grow store recommended was feed/water/feed/water...
Feed = drain...