i originally started with tap water but the leaves started turning yellow so i started letting the water sit for 24 hours before i watered the plants. That wasn't helping so i figured it was a nutrient deficiency and added fert to the water. I'm gonna PH test the plants today and post the results. Also what exactly does "flushing" mean? is it just watering the shit out of the plants? And how do i take a ph test, should i add some soil to regular water and test it or should i test the runoff?