after takeing cuttings and rooting them in peat pellets i transplanted them to red plastic cups to veg a little untill i flowered them. the cutting were around 3 inches and i was going to flower them when they reached 4 inchs. after a week most of my clones havent reached 4 inches. i have them under a 400 wattt MH and they dont seem to want to grow. why? can anyone give me advice as to how to get them to get up there. my next grow i want to start them at 6 inches but at this rate.