"I thought this was an interesting observation. I'm hoping someone will confirm that they've seen a similar color change, and maybe explain why. I noticed it again this morning. When I turn on the light, the Serpae's are all close to the bottom of the tank, moving very little, and their color is pale. I come back 5 minutes later and their color is restored and they're swimming around at mid-level as usual. Neither my hatchet fish, nor my cory-cats show this dramatic a change when I wake them"