I have a rubbermaid grow box that is 1' by 2' with 8 23 watt cfl's. Ive kept the lights within two inches the whol time but they seem to be growing very slow. At week three there only three inches tall. Istarted from seed. Im just wondering if they should be taller. I havent used any fertalizer yet. Should I start with quarter strength to speed it up a lil bit?[