I'm 4 weeks from seed.
I'm using 66% Ocean Forrest, 33% light warrior.
I started using a seed tray, then transplanted into light warrior at about 7 days. About a week after that, I noticed yellowing on the bottom leaves. What I didn't know is that light warrior provides no nutrients, and so I did a 1/2 strength nute using fox farms, but within 24 hours just decided my best bet was to repot into 66% Ocean Forrest, 33% light warrior, as OF should have enough nutes to last a couple of weeks (or so I thought)
The plants seemed to take well to that, but the existing yellowing got worse, which I expected. Those leafs dropped.
Now, the yellowing has suddenly came back, and worse it is now effecting the one plant that previously showed no sysmtpoms.
The plants are under a 400W in a cool tube. The temperature at the canopy is a max of 78 degrees, and around 70-72 degrees during the dark cycle.
I water every 48-50 hours--whenever the cups feel almost as light as a solo cup of dry medium. I'm using distilled water and the PH is right around 6.5.
I've done one 30% strength nute since the yellowing showed up on the previously unaffected plant. The yellowing/browning continues, all on the lowest (largest) set of leafs.
Any guidance would be great. I don't want to put in nutes if the soil is already too hot.