H=DWC with air stones and ultrasonic fogger T= HydroTon D=Auto drip system- drips about 1 per second E= EVERYONE needs to answer lol! E-indoor E-DWC/hybrid E-HydroTon E-Water source - well water pH'd before adding to res. E-Source water pH - 7.0 from tap, adjusted to 6.5ish before adding HRT-?? Dont have the ability to test PPM from tap is around 150 before nutes E-Age of plant - 16 days E-Type of fertilizer - TechnaFlora products E-Rate of application - add nutes to 1 gal backup res which is slowly dripped into system when needed E-Lighting source and distance from plant - was 10" away, now about 1.4 feet E-Air temperature - Day was 78-83, now constant 75. Night temps around 70. HD-Reservoir temp - was in the 80s, now around 75 ( I know this is hight, i am working on a chiller) E-Air % Relative humidity - 35 - 40% E-Lighting schedule - 18/6 E-Type of ventilation your room has - Sealed light fans, 2 intake, 1 main exit, and circulation fan. TR-Did you pre-soak your media in pH corrected solution? Well, no. I did soak in pH water, but not for as long i should have Below are a few pics I took to day. I noticed the brown spots on friday, and immediately thought nute burn, so i dumped the water and refilled with normal pH water no nutes. This is a 10 gal res, 11 plants. Not all the plans are having the problem. Some are doing just fine while others arnt. I have been using the TechnaFlora suit of ferts and nutes. Followed their instructions, but not going full strength. They say to add all this to 1 gal of water, but im not sure if the 1 gal is enough for all 11 plans, or if i should have been adding the nutes according to my 10 gal res. So i guess my main question is nute burn or deficiency? Since changing the water, i have begun feeding them via a spray bottle individually, using a very diluted nute solution. Images 1 and 2 show the problem plants, pic 3 is healthy. Again, same water source for all.