Any help is greatly appreciated. This is an OG Kush midway through week 5 of flower. Indoor. She's organic. Nuted w/ Bio Flores and SensiZym. Full recommended dose of each. 400w HPS. Lots of fresh, vented air. Nice and dark at night. Ph looks OK. Temps/humidity looks OK. But in the last week or two she's been getting mighty yellow. I added some epsom salt and this looked like it improved a bit. But not fully. I tried flushing. And now the new growth is more yellow than ever. The mid-level leaves are mixed yellow and dark green. Lower stuff is nice and dark. New growth pretty pale. Mind you these pics were taken after I pulled the worst offending leaves. Pic 3 is the one bud with some damaged leaf tips. Otherwise the rest are good. What do you think?