I would say that those plants/pots are far to small to have a hot supersoil on the bottom of them. With plants that small you generally want to start them in a soil that isn't too hot and then pot up to container with a bottom supersoil layer when they are more established and can handle it.
Ive used promix for years without adding any extra ph amendments and don't have problems with early yellowing. I've never even taken a ph of my runoff or PhD my water.
Those plants are pretty small for the size of the pots you have them in. Next time let them get a bit bigger in veg before you flip them and keep your light a lot closer in flower.
How much fertilizer are you using per gallon. Are you fertilizing every watering? You have burt tips on those plants which would suggest overfeeding. You often see yellowing after nute burn because of lockout due to excess salts... which makes guys assume there is a deficiency so they keep...
I've grown a lot of autos and most of then have full weight by week 7-8. They mostly just need the few extra weeks to ripen up a bit. I've harvested strains like dinafem critical jack auto and Dutch master think different at 8 weeks when I first started growing them and they were smokeable and...
In my experience autos go about 9 weeks seed to harvest. Maybe 10. I haven't had any auto I've had that I needed to have go longer than 10. Some of these autos are done with growth but don't really undergo Trich degradation to amber. I'm assuming these guys waiting 100 plus days are waiting for...
I think closer will be fine but you're gonna go below 500 par in the corners of a 5x5. You'll get better across the whole canopy results at 36. Closer and you'll end up with a little less dense outer plants. It's your choice. At their recommended 30 inch hanging height you're only gonna get some...
My biggest auto was a cross of sweet skunk/ dark devil and was about 4 feet tall and yielded almost 7z. I think one in a 2x2 sounds about right of you're doing dwc. Two might get a little cramped but you can still do it in a 2x2.
I personally don't even know if you can save those at this point. If you have more beans you might wanna just crack more. If you really wanna try and save them I'd flush them with a good amount of regular water to get whatever extra fox farm nutes you have in there out. Even if they do manage to...
I believe he's correctly suggesting that you fried the shit out of those seedlings by severely overfertilizing them. Are you giving those fox farm every water?
Looks like that soil already has some nutes in it to begin with. If you're feeding it fox farm as well youre just scorching the shit out it. I personally like to start seedlings in a non fertilized medium and even then I don't fertilize with maybe 1/20th strength till day 10-14. Fox farms...
You bought the diy kit of the 600rspec. Same thing. Here's a good par breakdown video. Guys testing seems to show that a 36 inches above the canopy is gonna be best for that light in 5x5
I'm about positive this Volt light is the exact same as the medic grow just branded different
https://www.voltlighting.com/fl1-full-cycle-led-grow-light-120v
Same watts, diodes, spectrum and the measurements of the fixture are exact to the decimal points
I wouldnt prune too much now. It looks like you're about to hit peak swell and shocking the plant now is a bad idea. Best time to remove fan leaves is day 21 so you recover for week 4 and 5 swelling. A few won't hurt if they are covering other budsites.
You can start a photo on 12/12 from a little after seed bit you are going to end up with a small plant with minimal yield. No auto I've done has been 7 weeks. If anything I find they go a week or two longer than what's quoted by breeders.