This is looking a lot like thrips or spider mites to me. I would verify what bug it is and treat the plant asap.
Given that it is still in veg it would be best to use a heavy hitter chemical treatment as it will be long gone by the time you enter flower and has a good death rate.
Other options that I have used in the past with success are predator bugs. They will eat the bastards eating your plants. :D
Check you your local grow store and ask them about them or order some online but only from places close by as they do have expiry dates.
Best Of Luck!
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