I have a few late starts that are still inside under lights. Up until about a week ago they were exploding with height and new leaves and then ask of a sudden they just stopped. I'm using 4 T12 GE plant and aquarium lights about 12hrs on and off. When I feed, I feed with a mix of fox farms grow big and cal mag mixed to the mfg. Specs on the labels. Ph is in the 6-6.5 range. Anything else you guys need to know just ask. I will post pics once I get out of class.