You can test ingoing water with a freshwater aquarium ph test kit. ($7.00 US) I'd try and get one this weekend, and flush the excess nutrients with at least 5 gallons of properly ph'd water, (6.3 to 6.8 ph) and resume nutes on their next feeding day per the FF schedule.
Leaf damage is permanent and will look worse as time passes. New growth should be fine once you get your ph and nutes back under control.
Rusty Trichome Reviewed by Rusty Trichome on . Yellow discoloration and dying branches The leaves of my girl in bloom are getting yellow on them and dying mostly on the lower branches the top and middle of the plant look great E- Indoor E-Soil E-specific medium Not sure what this means.... CSL-Soil type/brand Black Gold .13-.5-.10 HCL-Hydro/aero/soilless system type SCL-Miracle Grow during vegatative stage and Tiger Bloom during Flowering SCLR-Soil or slab runoff pH (Unknown) Rating: 5