Goby color changing

[Tanking in the 603]

We have two sleeper banded gobys. In our reef tank. We have noticed that every once in a while they have new spots or their colors are brighter. Today we noticed one of them now has a black line on his face, kind of like a mustache. Anyone have any insight on this?

 

[Jvesche20]

Welcome to reef2reef! Some of my fish have spots and some days they are brighter than others. The fish that does this the most in my fox face. At night his body gets very pale and he has black patches all over his body then when the lights go on it goes away and he has one spot on his back.

 

[Dragon52]

Welcome To R2R