its really hard to tell from that pic.
do you have anything on the undersides of your leaves or crawling in your soil?
most common pests are
fungus gnats aka fruit flies aka scariad flies - doesnt look like this
spider mites - unlikely as this seems to big
thrips - possibly these are both black or brown or white.
aphids - another possibility these are lots of different colours but normally found around stems and branches.
best chance of an ID is to catch one and search plant pests til you find.
i can recommend 2 things that will get rid of vitually any intruder in your grow room
SPINOSAD aka MONTERAY GARDEN INSECT SPRAY
HOT SHOTS NO PEST STRIPS
i use both of these hot shots is constantly hanging in my grow room and i spray all plants once a fortnight with spinosad as a precaution.
Do a bit of research on them you will like them.
J