Yellow watchman goby is gray?

nanoreefs

Reefing newb
Hey guys I have a yellow watchman goby and the lights have been off for a day and just turned them on and he is a grayish color he is still eating and moving like normal, is anything wrong with him?
 
A lot of fish change colour when they sleep. I'm sure it is noting to worry about. Especially since he is acting and eating normal.
 
Some fish will also change colors if they are startled. If the lights had been out for a while and suddenly turned on, he could have been scared by it.
 
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