I have a question about flushing. All of the strains I am growing are 8, 8-9, or9 weeks strains (Permafrost, WW/AK-47 Jewel, White Rhino, OG Kush, and Nepal Hash). Tueday, the 19th, will be the start of week 6 preflower. I want to flush at that point to get a full two weeks of flushing, but...