Originally Posted by Impulse09
It is the opposite, his stripes go away with the lights on and the come when it is dark or when he is feeding
Jinkies, a mystery!
How bright are your lights? How great is the color change from stripes to no stripes (are they gone completely, and when they return are they light gray or black)? I know hardly anything about aquarium fish (new) but I want in on this puzzle.
Some animals change color easily --like chameleons, octopus and squid-- but there are other species that can too, to a lesser degree. Maybe angels are one of them, and it's just not commonly noticed?
Here's a thought (indulge me): what if it has to do with bloodflow? You say when he's eating and when the lights go off his stripes darken. Maybe it's a fear/agitation/aggressor response? Maybe while he's eating his stripes darken to break up the shape of his body (like fish in the ocean, who have lighter bellies so that when they're viewed from below they're more difficult to see)? And when the lights go off he darkens his body again, because a large pale body stands out more in the dark than a striped one?
I don't know: I'm guessing. I'm sure I must sound like an idiot and some expert whose owned these for years will go, "(This) is the reason it does that!"
How about this? Your fish is a freak.