Without seeing them better, I'd say they look almost exactly like spider mites. What stage of growth are you in right now? Flowering, veg, etc... Also, how many plants do you have?
There seem to be a lot of them so I would take care of this very soon if I were you. There are organic sprays you can get from Home Depot, also you can get foggers from hydro stores. Foggers kill the bugs but not the eggs. The sprays can kill the eggs, but you are spraying directly onto your plants... not totally desirable in flowering, but safe if you use organic sprays.
Mr. Bond