Probably, because the plants are already in large containers. You have alot of root mass woven in that soil now. I'm having to make a guess here and say that this is largely nutrient related. It looks like there is an nitrogen deficiency problem as there is quite a bit of yellowing at the lower and middle leaves, so I'm going to suggest either dynagro 7-9-5 (Grow 7-9-5) fert from the hydroponic shop or something similar like Schultz brand (Where To Buy). Your temp about 80 is a little warm for an indoor grow but what you should do is put a good size fan in there to push air around; get the warm air out and cool air in. For the ferts, just get the smallest one you can and follow the directions on the back. The ferts in your soil are fine but without bacteria to break them down, they are useless. Try Happy Frog next time.