Flushing! Added some Clearex this time to help leach the salt nutrient build-up. 1/2 tbsp/gal, added to plain tap. Will flush for up to an hour with this solution, remove it, then fill the res. w/ plain water again and adjust the pH. Then run it for a week or two. The foliage is still a very deep green, so I want them to use up all that energy. I may be a little late on this but it's still hard to tell when these babes are ready under LEDs. These finished much faster than my last bunch.