I have seen my foxface's do this...but never a blue chromis. I know there is nothing wrong, just a lot of changes in the tank and house. I just didn't know they could.
I had 5 lemon chromis and they always did the same. The were patchy grey for a while when they were first introduced but eventually turned yellow. They always turned camo at night and pressed themselves against the black background of my tank and I could barely see them. Was pretty cool to watch.
one of mine done this 2 nights ago,when i get home from work i use a bright flashlight to look around,and this chromis was full camo,never seen that before
I have a few in my tank that does this at least once a week.
I only see it first thing in the morning when I check my tank before work with the lights out