Maybe he needs to let the pH come up a little bit in that range there. The pH range I use is 5.8-6.2. Also, maybe the particular strain he's growing is a nitrogen hog. Or, could there be too much P in his mix, thus leading to lower leaves browning on the edges, yellowing, then dying off?
Wambam, you've gotta give us a little bit more to be certain, but here's a cheap and easy answer for you below that I use on a regular basis. Can't be drinking a buncha beer or iced tea if you want to do it, though.
i think i have a nitrogen problem,is there anything i could use without having to visit the grow shop?
Yes. Pee. Diluted properly it's a good push. Assuming it's not very watered down from drinking too much of anything, I'm talking a nice, healthy, clear but distinctly yellow pee.
1C/5gals, and if you think it's very strong, use less.