If they’re growing for personal use in their home ambient co2 is plenty, no need to seal anything. Humidifier with hose set outside the tent for veg, exhaust fan set low, good sized dehumidifier in the tent’s room exhaust fan set to high in flower
Yes problems in the root zone from overwatering can lead to yellowing/spotting. Just follow one of the many start to finish guides online. Quit trying to mix and match from different sources and thinking you’re doing your own research. Find some directions that work with your resources and...
It looks likes he’s using dynagro and potting mix though.
Might not be enough drainage in those buckets, maybe elevate them a bit and drill a couple more holes in the bottom
This is why I presoak lol also I’m in hydro so tighter timelines for shit to get done. Ain’t knocking ya though kinda neat that they’ll do that sometimes
About 2ppm (250mg/12gal) let’s see what it do
https://pmc.ncbi.nlm.nih.gov/articles/PMC10304255/#:~:text=Gamma%2Daminobutyric%20acid%20(GABA),to%20biotic%20and%20abiotic%20stresses.
If you want more oxygen in your root zone use fabric pots instead of buckets and add extra perlite. If you want to make a bunch of noise and probably wear out an air pump quickly… or you could give hydro a shot it’s fun
Just measure your fill and mix for the total. You’ll probably have extra solution by the end of stretch in flower and your roots are fully mature. My systems 13 gallons full at the start (3 plant buckets and a res all 5 gallon buckets) and like 9-10 by mid bloom