Went on vacation and had a shortage which resulted in the light being off for 2 days . Then flipped 5 days veg cycle on before flipping finally to 12/12.
Plants looking healthy imo and start to produce first hairs.
Watered straight water . 1l per 3 days. Gonna up the water soon as they seem to get thirstier.
The tops are now getting close to 900 PPFD.
I don't believe your soil is depleted. Roots cant absorb the nutrients that are there when moisture levels aren't correct/ theres not enough dry out. The small root hairs begin to rot when the average moisture is too high. You might have to slightly adjust your watering amount to less, or adjust the time between waterings.. Thats my 2 cents based off what I see