What's up everyone. I'm three weeks into flowering and all of my fan leaves are turning yellow. I did a nutrient change seven days ago and the next day I started to notice a change in color in the leaves. When I seen this I removed a few gallons of water out of the resivor and replaced it with new fresh water lowering the ppm level. I keep my ph at 5.8 to 6.0 and check it every day. I had not had a problem tell the resivor change last week in which I did bump up the nutrient level. Today the independent leaves have almost all turned yellow some with green veins vividly pronounced. I changed the resivor and added ONLY water to flush the plants in hopes to change things. All of the flowers and the the connecting leaves are still green and look health. I'm not positive on what I need to do so any help would be appreciated.