8 blueberries surround 1 afganni kush. 600w hps, ebb n flow, in a 4x4 tent, co2 enriched, rh stays around 45%and I am in week 4. Kush is thriving! Blue berry is yellowing and leaf tips burning. Think it might be potassium deficiency or im burning them up. Dropped ppm 100 and added .5 teaspoon gallon Liquid Karma. I flush weekly. Im gonna stick to the Kush for now on but I want to make the best out of these Blueberries. Help me save my Blueberries.