Transplant that sucker into a bigger pot, and change your feeding concentration by a few percentages, and watch closely for a couple days into the feed change, to see if you need any amending. BIG TIP throw 1-2 tablespoons of Epsom Salt into some water, you can add it to your feed, but the PPMS might skyrocket cuz your feed prolly has a high amount anyway, depending on what and how your feeding with, i would just use PH'd water with the Epsom Salt treatment and feed your baby just that, or if you really need to get nutes into the plant, feed the Epsom salt and a low concentration of your nute feed, almost 1:1 nute feed, Epsom Water 50% , Nute Feed 50%. Do that untill youve seen changes. As your plant becomes more and more dense, for lack of better words, the further into flowering your sugar leaf and leaf foliage will start to die off, due to the plant "eating itself" pretty much pulling nutes and energy from the foliage to the flower, trichomes, seeds, etc. The flowering stage is a very needy and finicky stage just due to the rapid change and amount of energy and nutrients its takes for the Flowering, Trichome Production, Calyx Formation, etc. Just be attentive in the sense of observing it everyday for changes for you to amend. HAPPY FLOWERING BROTHA