My leaves have slowly progressed from simple yellowing, into this. Leaf tips are curling up and twisting on older fan leaves and the problem is working it's way up the plant. There is no green in the leaf veins, just yellowing. The tips are getting crispy (dead).

Indoor
Soil
Fox Farms Ocean Forest
Dolomite Lime added
Hmmmm....pH'd tap water at 6.6 run's off at 7.1, too much lime? Why would too much lime be presenting a problem now?
Tap
7.something water source
Day 51 flowering, 89 days old total.
Fox Farms ferts.
Stopped heavy feeding weeks ago, currently flushing. Fully flushed plants 3-4 days ago. (5 gallons ph'd water through each plant, no ferts. added.)
600w HPS, 15-18 inches away.
75-80 day, 60-65 night.
40-60% humidity
12/12
Passive intake ventilation
norkali Reviewed by norkali on . Mg deficiency? My leaves have slowly progressed from simple yellowing, into this. Leaf tips are curling up and twisting on older fan leaves and the problem is working it's way up the plant. There is no green in the leaf veins, just yellowing. The tips are getting crispy (dead). Indoor Soil Fox Farms Ocean Forest Dolomite Lime added Hmmmm....pH'd tap water at 6.6 run's off at 7.1, too much lime? Why would too much lime be presenting a problem now? Tap 7.something water source Day 51 flowering, 89 Rating: 5