Last w/e my scrog plants took a painful hit. Got a new BlueLab PH pen (which I love!). Watched the hydro store dude “calibrate” it at the counter, so I didn’t do so myself. Took me a couple days to nail the pen down as the issue, as I had made various other environmental changes during same period. Lowering of light, increase in ambient air temp. After reading the pen manual, as I should have done, turns out initial calibration & even subsequent calibrations are more involved than what seller did. Such as 24 hour soak in hydrating liquid. As validated via PH color drops, pen was off by 1.0-1.1. I flushed plants with PH’d water. Earlier I’d backed temp down couple degrees & raised light a bit. Plants have continued to grow, & looks like I have lots of tucking to do today. Pretty sure the worst is behind me, and very pleased with my girls for being resilient.This is why I don’t grow hydro. I make too many mistakes - I need the buffering action of soil.
Screen is nearly full, & I’m still in flip transition (I don’t go straight from 18/6 - 12/12). Will complete the flip today, going to 12/12. Didn’t want to do it while things were effed up.