Perky Leaves with brown spots

Hey guys, got what i hope is a minor problem. I know perky leaves usually means happy plant. But the brown spots are on 5-10% of the leaves for past 2 weeks or so. These pics are day 12 of flower.
Room temp 76-78
PH 6.2-6.5

Any advice will be much appreciated thnx in advance

Looks like you have a potassium deficiency going. By this stage of the game, you should be using a fertilizer/nutrient mix that has more potassium and phosphorous than nitrogen.

What's the NPK ratio you're feeding them now?

Im not sure of the ratio my friend told me to use. But i am using fox farm soil which doesent need nutrients during veg but this started during veg.