White spots on leaves. help!!!

This is my second grow and ive seem to have run into a problem. about 2 days ago i had to put my plants outside for approximately 7 hours and i'm afraid they have now developed mites or something. when they were brought in they received a watering and i gave them a bit more of a heavy feeding than normal, so im praying that has something to do with it, but deep down i dont think it does. I tried to look with my microscope and i see little black specs on the top of some leaves, however i didnt see anything moving so am hoping its just debris from being outside.



So, what do you guys think?

check under the leaves mate anything u see give it a little touch if its mites u will see it move