stonerjoe

I am doing my first grow with some Indica seeds from a friend. I have a 4x4 grow room with a 400 watt MH for Veg and 400 watt HPS for flowering. I am now in week 5 and have put the plants into flowering and set the lights to 12/12. Their are 15 of them. Some were showing some signs of preflowering, but others might not have been. That is what I am worried about. Did I jump the gun on putting them into flowering? The reason I did was they were growing extremely fast, some about 28" tall. I only have space for them to grow to about 61" or so. The plants seem healthy, but I have needed to stake most of them to keep them from falling over. Is this normal? Especially after watering them they seem to droop. I did top half of them a couple weeks ago to help with the height problem, but my main concern is that I put them into flowering too soon since they are from seed. Should I be worried? How long should I have to wait until I can sex the plants. It is getting really crowded in my grow room and would like to remove the males? Thanks