Soil pH should be 6.6-6.8 ideally.
Soilless should be 6.2-6.6 ideally.
Looks like possible Ca def or lockout due to high pH; a plant right under the light will grow more rapidly and use up available nutes/minerals faster.
When was the date of your last re-pot?
stinkyattic Reviewed by stinkyattic on . Calicum deffiency?? E-indoor E-soil E-specific medium- FFOF with 1/3 pearlite SCL-Have been using FF ferts big bloom(4tbs) and tiger bloom (7ml) SCLR-6.7 roughly with my Gh test kit E-Tap water E-ph 7.5 going in E-2 month old plant E-600 watt HPS about 18 inches from plant E-80 Rating: 5