Potassium is locked out, likely by.... low pH!
Check and adjust if needed. Try foliar feeding to keep it from getting worse while you fix the soil situation. Use a complete grow fert with K and micros, mixed up kinda weak, like 1/4 what the bottle says.
stinkyattic Reviewed by stinkyattic on . Please help me! - Power plant growing indoor - Biobizz all-mix soil with 30% perlite - Ph roughly 6.5 - Tap water with a few drops of vinegar to lower Ph - Plant about 3 months from seed - Baby-bio fertilizer at 5 drops per liter - Fertilized every other watering - 3 x 20w energy saving cfl 3 inches from plant - room temp about 72 degrees 24/7 - relative humidity unknown but it should be low Rating: 5