Need help identifing this possible nute deficiency

[InsaneTheySay]

housing some plants for a buddy and getting a few in return, but i noticed this and couldnt find a definitive diagnosis when image surfing. Its only surfacing on a few of the strains and I am seeing it on the new growth as well. If you look see closely you can see its literally burning micro holes in the leaves. Nute deficency or something worse? Any help is greatfully appreciated

 

[WelderDan]

What is the PH?

 

[InsaneTheySay]

Ive only given the plants two watering cycles since ive got them, but am watering at a 6.5. There are definitetly signs of other nutrient deficiencies on some of the other strains and Im hoping theyll clear up within the week. But I just went back out there and took another look and this particular abnormality is most prominent on the upper newer growth, which to me seems strange for a deficiency.

 

[WelderDan]

Have you tested the PH of the runoff?

Deficiencies can be caused by several things. PH being one, over ferting is another.

What are you using for ferts, what's the deeding schedule, the medium and temps?

 

[native_garden]

looks for me like a potassium deficiency, you can check it on google

 

[InsaneTheySay]

Ill check the runoff and teml tomorrow and get back to you Dan. As far as feeding, I havnt fed yet and have no idea if he fed at all to be honest. Im going to start a 1/4 feed every otger day starting Friday. He told me it was froat burn, but like I said its still coming out on the new growth and greenhouse temp is a pretty consistant 75 to 85, with a 60 to 75% humidity. I dont think its potassium because theres little to no burn on the tips or edges. My first thought was magnesium, but i couldnt find anything looked quite like what Im getting. And its so consistent looking its a bit unnerving. Thanks for the replies by the way, much appreciated

 

[mc23q]

Have you done a thorough inspection for any type of bugs/pests?

Check under all the leaves and in the growing medium.