I have three plants sitting under a thousand watts. Each is in a 3 gallon pot. I use a small pump connected to a timer and I have to water for 6 minutes to I water four times a day. This equates to about 2 gallons of solution per plant per day. if I reduce my water time to 5 or 4 minutes I get no runoff. it has come to my attention that no one else uses as much as I do. What am I doing wrong?