Make sure your pH and ppms are good. You could add bennies as well if you want to be overly cautious. Tilt your pots to the side and give them a semi-hard WHACK to see if any critters come up. If all of that turns out good, just watch over a few days and if it doesn't get worse, then you're good. I don't recommend adding more nutes, it doesn't look like p or k issues and n isn't needed much in this stage.
As a last resort, flush her out.