This week I started to determine which 3 plants I would keep, so it was a bit of musical chairs. It was smooth sailing after that. I used advice of a lower ph and things started going really well.
I have small yellow spots on leaves. I want to say it starts at tips and travels down. I moved light away and it seemingly gotten better. I moved tents for bigger space and it might have returned.
Your nutrients are to high. Cut them in half. Hydro gives the roots direct access to nutrients so at full dose the plant will start getting nutrient burn.
Also you don't want light to get into your buckets, Any light leaks will lead to root rot. Raise the pebbles above the holes.
check out this diary for how much nutrients should be used in veg.
growdiaries.com/diaries/86068-barney-039-s-farm-utopia-haze-grow-journal-by-chow-13/week/445013
Happy Growing