I have had a 2 plants growing under 2 flourescent tubes. They just started to grow, and one is about 5 in. and the other is about the same but is growing sideways. The one that is straight up has been at the same length for a few days now and not really doing anything. The one that is sideways the leaves seem to be getting bigger. Is there any reason why the one standing up is just on a stand still right now....is there anything I can do to get it past this point??