What's your substrate again, hydro? With that range of pH swing, I'm thinking lockout. Hydro is normally best set for 5.8-ish, unless you're using organics to help with uptake. 6.8 is pretty high.
I figured this was some sort of pH problems I ordered a calibration kit for my digital pH tester last night. It has not been calibrated in about three months. What do you guys prefer a pH strips or a tester
I think I just figured out that my pH pen is reading 1.5 to 2 points high. I'll calibrate it tomorrow know more. I've been watching my pH and keeping it within what's considered the normal Hydro range. (So I thought) Thanks for the help so far
OK have corrected my PH problem and raised my lights a few more inches to ease That stress. Here's a photo of a bud that's in the same space about 18 inches away. Different DWC though.