You would be better off starting with solo cups and change/repot in steps. And take it from me trying to go bigger in the mid of a grow is a pain in the ass.
at what height should the plants be when i switch to a 18/6 cycle and how tall should i let them get before entering a 12/12 cycle my grow room is about 5 feet tall
so you woulnt suggest growing them to the height of the grow room. also what size should i start taking clones. and a problem im having is it is winter and im in my basement so if i turn on the fans it gets to cold so most of the time i have them off do you have any suggestions for heating? so i can keep the fans on all the time?