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Moisture stressed and/or underfed.

Looks like a ph issue, too cold & humid or possibly low oxygen in the root zone(oversaturated).

You tore new growth when you topped. Not an issue.

What is your npk with you solution of gh and ppm? I'm going to guess you could be over doing potassium and locking out calcium.

Water till the cup is fully saturated and put under a light. Don't over complicate things.

Jacks is not dyed. Some salts in the mix are not bleach white but the product is not dyed like: Mircal gro, GH, foxfarms etc.. Unless you're talking something besides the 5-12-26 maybe?

Yes, I got my buddy hooked on it but I'm getting away from dyes. Maxi works very good.

GH flora also does great for me but I wish it didn't have the dyes. I just use the micro & bloom. 2.25ml of m, 2.5ml bloom per 1.5L for flower. Will probably pick up jacks with cal nit for my next grow.

Don't tell anyone, but I just started some 'kratky' cilantro in 400 ppm of urine water. It's crazy how concentrated urine is. About an oz or 2 in 16oz RO water gave me 400 ppm. Couple days of pee is like a 20$ bottle of hydro fert lol

At week 9, yes it's yellowing too fast. Feed or up your feed and that feed should be a complete fertilizer, including N.

Around 400-800? Those aren't remotely close. Stick to 800 and drop your ph to 5.9. Temp and rh%?

Do you have a fan blowing on it? What are your temp and rh numbers? I'd double check your ph with another tool, also.

Very low vpd. Plants aren't transpiring like they should. Getting the temperature up 10 degrees would help. Could also be underwatering; hard to tell how dry the grow medium is.

Always lean towards the safe side of things when drying and avoid ruining months of work, until you got the process down.

I would try feeding 550ish ppm(500scale) or as close as you can and if possible, adjust that solution to a ph of 6.5. Tigerbloom is high in phosphorus and better for tomatoes than cannabis. It does work but isn't ideal imo.

Definitely low ph. With feed you're probably down to low 5's. With peat mixes I like to raise the ph of the nutrient solution to counter the peat acidifying as it breaks down. You didn't say humidity but running a heater I'd say it's probably dry and could be causing your plants to take up...

Room temperature and humidity? I'd guess low ph. Day 50 with a peat mix and adding feed to acidify already acidic water. Unless 6.3 is with feed.

I'll just add that with feeding the correct amount(not under or overfeeding), you will never need to do either. I get 0 run off and never dump large amounts of water through the medium at once. My plants always yellow out or 'leach' at the end too and that says to me, no build up. Gh flora...

Too much N was correct, but 'flushing' no. You had some 'clawing' from N but that is irreversible anyhow. Next time just adjust you npk so you use half the N for a watering and go from there. If the 1 or 2 part fertilizer doesn't allow that, just cut back to 2/3rds strength with runoff. But...

I'd suggest mars hydro if you want budget. The ts1000 150w would grow 1 plant in a 3 gallon fine. $100ish