Your runoff is 7.1? Thats too high.....you're locking stuff out. Flush with water at a lower ph (say 6.3) until the runoff is NO higher than 6.7. Then give nutes at a low-but-in-range ph level.

If you've been "flushing" or not giving nutes for several weeks they're probably starving anyway. But correct your ph first.
Weedhound Reviewed by Weedhound 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