[Cichlid Man]

If cichlids are used to being kept with lots of other fish and seem to swim around a lot being happy then this is usually accosiated with the fish being freindly and sociable, however this is not usually the case. Angel fish have been observed in the wild and captivity and scientists have noticed that some groups of angel fish only come out of hiding to feed and swim around when there is a shoal of tetras near by. Angelfish have been thought to do this because they think if there are no other fish around that there may be a predator lurking around somewhere because the other fish are hiding from it. Also from my own experience, I used to have pair of angels which used to hide behind a rock all day and it was only when I turned the aquarium lights off that they came out at night, but as soon as I later on added 5 platies they used to swim around all day.
The colour change in cichlids is usually an indicator if mood. Lighter colours being associated with trying to camoflage with the surroundings if there is a predator about, dark colours with stress, and a contrast between light and dark strips with dominance or breeding.
He should be fine once he has settled down.