chromis stuck in reverse

[Mike-fish]

one of my blue-green chromis is stuck going backwards around a rock.
moved the tank a week ago all fish were fine after. the chromis wanted to hide in the same hole as my foxface who didn't care for that idea at all and displayed a bit of territorial behavior for a couple of days until the chromis disappeared, for a day or 2. he reappeared yesterday making slow circles around a rock going backwards. any ideas?