Brown spots on old growth.

I have started noticing very small brown spots on the older growth. here is some background though they are under cfl lights and have had some high heat that i fixed this week. They are in a soilless mix.
The are 3 weeks old as of today and the breed is dinafem white widow autoflower. I just started feeding them and so its possible its from a deficiency i just cant tell which one help?
PICS

They look good to me. If that small yellow spot in the third picture is what you mean it looks to me like a droplet burn. It also looks like the bottom leaves are not getting enough light.

ok I wasnt meaning to be paranoid but i though i saw more on other leaves i guess you will see what you want to. They probably arent getting enough light I need to put in some hanging cords.

Yeah looks fine to me