changing colors

It could mean that they are scared. Or when they go into the rocks to go to sleep, they loose a lot of color for protection.
 
Yep indications of stress on the fish as well, not that they are just that could be a cause, if you know your water to be alright they should be fine and are just startled.
 
My metallic blue damsel goes a brown colour when I put my hand in to feed, but it doesn't stop him almost taking the food oput of my hand. he soon goes back to a lovely blue after a few seconds. When I bought him and first put him in my tank, I thought they had given me the wrong fish, as he was a dull brown.
 
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