I appreciate the suggestion. It most likely is a salt buildup because I don't water enough to leave much runoff which is a mistake and why I am having to deal with this now. I also can't seem to nail down the exact deficiency which leads me to believe it's several which typically means lockout...
-Week 4 or 5 flower
-Growing in happy frog soil 3 gal pots
-Fox farm big bloom, grow big, and tiger bloom 2-3tsp/gallon each every other watering
-Plain PHd tap water every other watering
-PH of runoff is around 6.5-6.7
-Seems to be occurring on the upper fan leaves so a mobile nutrient...