Hi guys what kind of deficiency is this ? I grow i...

"6-12-6 isn't that bad per se, but you have to kinda use it at lower levels and use adjuncts, imo." Sorry, I mean with respect to your plant maturity. Phosphorus isn't exactly the most abundant element in growing, even if it's very important, especially in later flowering and for rooting.

Imo you've got ph and nutrient imbalance issues. I don't think you have potassium deficiency as much as excess of other factors/some lockouts. As a general sort of cheap approach, try halving (ur using even less) your current nutes, adding a bit of calcium (specifically more calcium than magnesium), a bit of citric acid/lemon juice and something kinda general like molasses (doesn't have to be molasses, but something with carbs/sugars, potassium, magnesium other elements at low levels so as to be "safe"). It often helps normalizing issues. 6-12-6 isn't that bad per se, but you have to kinda use it at lower levels and use adjuncts, imo. *excuse my typing, had to repost that coz I edited and kinda fucked it up

6-12-6 is pretty low for a healthy grow. The last 6 is potassium (K). Should find a better nute for next grow

Bit of calmag an making sure ya soils not getting to cold nor sure what season ya in getting cold over my way had to make a few room changes to suit the winter conditions. Least ya got onto it early.

You shouldn't have k deficiency in veg under normal conditions. is this auto or photo? I usually see K deficiency during stretch in coco,for some strains. Dont forget to add base nute bottle "B" which has more PK.

Should I add some potassium in small dosage even if I’m in veg still ?

potassium