need help on yellow leaves and brown spots down center

[Rusty Trichome]

I've also noticed that transplanting a week or two into flowering to a new pot helps with the problem of ph drop/buffer depletion.

Yup. The added rootspace is a bonus, too. :thumbsup:

Rusty Trichome Reviewed by Rusty Trichome on 03-19-2010. need help on yellow leaves and brown spots down center What is your experience level? (first timer Your Equipment: .1) Type and wattage of lights. 600w hps .2) Distance from tops? 8" .3) Reflector type? enclosed air cooled .4) Is there a consistent fresh air supply? yes .5) Do you have an exhaust fan and a circulation fan? exhaust yes circulation no .6) What are the bulb wattages, kelvin ratings, and schedule? 600w 12/12 Rating: 5