Yet another plant problem

[tip302327]

Any ideas?

Straight coco w/ 1" gravel in bottom

3 gallon bucket hand watered once daily w/25% runoff

H&G nutes at 500 PPM

PH = 5.9

Lemon Kush from seed 7 weeks old.

Seems like it comes and goes but only on older fan leafs. top growth is perfect.

400W halide 18" above canopy

RH 47% and temp is 65F night / 78F day

City water at 70 PPM base.
Any guesses. T

tip302327 Reviewed by tip302327 on 07-05-2009. Yet another plant problem Any ideas? Straight coco w/ 1" gravel in bottom 3 gallon bucket hand watered once daily w/25% runoff H&G nutes at 500 PPM PH = 5.9 Rating: 5