Looks like an oribatid mite. I get explosions of them once in a while with my no till recipe, then the ecosystem evens them out. Mine usually stay soil bound but sometimes they wander a bit. Just hose your plants down with neem oil or a neem+kelp tea if your aren't too far into flower. If its bulb or oribatid, it won't bother them. They came free with your compost.
They're all through your soil? Really slow a stupid? If so it's likely oribatid, and they aid with the composting process. If the population gets out of hand you can throw some melon peel in your mulch, once you see them all over it, pull it out and toss it outside. Repeat until you're comfortable with the population.