yellow leafs

Hey guys I came up woth this problem and I want to double check if its really sulfor deficiancy or is it something else? Grow is indoors - living soil - just water amending every month - coots recipe - temps n19-20 d27-28 - everything is diled in just weird few plants does that strain plasma...

Hi, I have plants about 3 months old in veg and now last 21-14 days turn bright green and dropping bottom leafs. I fertilize with a biobizz fishmix, bioheaven, activera, callmag, 3 times a week 300 ml per plant and watered 500 ml per plant I tried to flush 14 days ago and they still look the...