Pink Spotted Watchman Goby's head turned black

[Chortanator]

Hello,

I recently got a pink spotted watchman goby, about 2 days ago. A few minutes ago, his head turned black. Is this normal? Should I be worried? I should mention that we currently have a thunderstorm going on and the power has been flickering.

 

[BadFish619]

Probably just stress indicator from the power outages. He's not breathing hard or anything?

 

[Chortanator]

Breathing seems fine but I'll keep a close eye on him. There are plenty of hiding spots for him but he's currently out in the open

 

[Mjl714]

Mine also exhibits a variety of colors depending on the situation.