Doesnt look like mites. That is the bad web maker in cannabis plants.
ill third this beings how small they are i dont think if it were mites your plants are big enough for them to build there lil webs so for a plant this small i can tell you one sure way you can eliminate the mite theroy just turn the leaf over and look at the bottom of it with at least a 10x id say nothing bigger than a 30x hell i can see the lil bastards with my naked eye maybe even a magnifying glass would work but if u see bugs then u got mites they live on the underside of the leafsI 2nd that, no peck marks on the leaves. Unless you have a small masturbating monkey running around your grow room, I don't know wtf it is.
Paging Dr. Core
If you want to know if you have mites, just mist the plants lightly with water. That will expose the webbing.....