I would not use pea gravel for your net pots, I would either use hydroton, Rockwool croutons, coco coir or nothing except a neoprene net pot collar. I would use either a air stone or a spray bar or both, Stinkbud's container system uses spray bars and is said to work quite well. if you are going from rooted clone to a Deep Water Culture then 300 PPM may be good to start with as long as the roots reach down into the nutrient solution.
Harvest a pound every three weeks! The Stinkbud way
Harvest a pound every three weeks! The Stinkbud way