I am not new to growing but I am unsure how to proceed. I have just gone from a 16 plant setup to a double plant setup. I always flushed my big plants (3-4 feet) for 2 weeks. But now I have only one plant that stands about 15" tall. My question is... How long do I really need to flush such a small plant in such a small setup? Is there really a difference because of the size?