ahahaha no I didn't leave in the sun, I just took them out to the shade for an hour today so my electrician can add a ground wire in the grow room power supply (since I got electrocuted yesterday -- an incident that caused me to look exactly like your avatar
@Bernie420 and by the way, I was def going for the white-room insane asylum look in my grow room; now I just need those padded walls!!!).
I did some scouring online and read mixed reviews about using the rooting powder, there was nothing definitive. So far, it seems to haven't made an effect after a couple days.
Today I took the bold move (yes I couldn't leave them alone, again) of
cutting off the growth and grow tips that were
not recovering / dried out / looking diseased and nute-locked.
Hopefully this will help, or maybe I've set the seedlings back again?
I know I sound so serious guys, even on these small plants --- I have a good reason, I am working on a university research project... For real.
Okay so next up: today I got two soil testers that arrived in the mail. One of them consistently reads 6-6.5 and the other consistently reads 4.5-5.
Any idea which model (if you have used similar models before) might be more accurate?
Also I must admit that my pH pen tester is a cheap one that I dont really trust (and perhaps cannot be bothered to contantly calibrate or keep in a solution) so I'm going to be using the strips from now on...
The pH test strips are very cheap, and I think pretty accurate?