Why my hammer looks 2 different colors?

[Notsolostfish]

Why my hammer looks 2 different colors at night? With lights off!

 

[moldos]

one head looks less open than the other, so it could be that?

 

[Clownfish134]

Why my hammer looks 2 different colors at night? With lights off

Why my hammer looks 2 different colors at night? With lights off!

It could be to due to stress to me it looks like is Irritated with something so it could be due to stress.

 

[Reefkeepers Archive]

Agree with above comment. When corals are closed the pigment is more concentrated and appears darker. Should open up quickly