I just got one today at the local fish store... There were around 6 different specimens... I picked the biggest on for my 120.... He was also the most social with his tank mates, and ran for the test food pellets with gusto.... The others they had, some ate and some didn't.... Also the others seemed to hide alot... Mine is 5 inches and was roaming his tank, with a 5 Inch Blue Tang Hippo, and a few others....
I acclimated him, and after 90 minutes of that placed him in my tank, and he is doing wondful... My Kole usually bombards new tank mates, but being the Foxface is 2 inches larger, he is in place... Not one peep out of him... he swims the other way.... The Fox has displayed his spikes a few times and changed color... Freaked me out, he turned colors in the drip bucket... He ate Mysid and Bloodworms thus far....
Good Luck!!