ive done my 12/12 cycle from seed. its been 4 weeks now. the tips of most of the leaves are turning purple and it still has not flowered. i have a co2 charger for 1 plant, under 3 26 watt cfl bulbs 2700k in a grow box. i have using a 19-31-17 nutes. anyone know whats going on? help??? :wall: