Should I start using as soon as preflower show? I have read that you should wait until week 5-6 to start bloom nutrients should start it then? Wanted to veg as long as I can. This is my 2nd grow, 1st coco, and 1st with mephisto. They are little small at least I think did crop kings 1st grow they were bigger at this point so not sure if these will take off.. cold temp first 13 days so may be stunted. Any help with what size the should be at this point day's 16-19. Sour bubblin crack, grape crinkle, and skywalker. Thanks in advance.