today a friend of mine was messing with my light fixture in my tank then i notice my blue hippo tang's black strips change into a light yellow color i then quicky changed the light back to normal but it took him a minute or two to change back to normal sorry i didnt take a pic but is this normal? i have two of these fish but the other one didnt change? what do you think might of happen?? is that what happens when they get mad? its never happen to be before until last night