Problem: Bottom Fan leaves brown and curled on edge and leaf yellowing
Medium/grow method: Jiffy Pot/Hydro
Feed: and supplements used: Foxfarm Grow Big
water source: Distilled, PH 6.5
Strain/age: Mexican Airlines/ 18 days
light used: LED – 150 watt – 18/6 - 8 inches from tops
Climate: I don’t have anything to measure either with but I am sure that both temperature and relative humidity are well within range
Additional info: It is starting to show on the tips of the next oldest leaves, It occurred two days after the plant was topped
Medium/grow method: Jiffy Pot/Hydro
Feed: and supplements used: Foxfarm Grow Big
water source: Distilled, PH 6.5
Strain/age: Mexican Airlines/ 18 days
light used: LED – 150 watt – 18/6 - 8 inches from tops
Climate: I don’t have anything to measure either with but I am sure that both temperature and relative humidity are well within range
Additional info: It is starting to show on the tips of the next oldest leaves, It occurred two days after the plant was topped
--- are you monitoring the res' pH daily? With the Di water (no pH buffering minerals) and the 
nutes (not "self-buffering" in solution), it may be prone to drifting out of range,.. also, what ppm's are you running? ...symptoms on leaves are a bit generic, could be a few things causing this, so I need this info,...
