Have got one angel fish not sure what type sorry he has black and white stripes. Now he nips and chases the other fish in community so had to quarantine him. He looks p*****. BUt he wont stop chasing and nipping. What to do as he is stunning to look at. Is it true their stripes give away how their emotions are or something.
I would agree with most everybody that you need to rehome some of your fish. Angels do get quite territorial. I have 3 in one tank and 2 are a breeding pair and stay together on one side of the tank, and the other one stays on the other side. I have pretty docile angels though, as far as angels go, as they are in a community tank that includes both long finned and colorful fish, and the most they ever do is peck at each other. For that matter, they really only peck at the other angels and seem to leave all the other fish alone, as long as they don't get too close.
I would disagree with Gatorbait though...my fish have learned to stay out of the angels' territories, which mostly consist of the intake tubes to my filters.
And yes it's true that their stripes show their emotions. When they're scared or stressed or are what I like to call sleeping (when the lights are out in the tank they kind of go into a trance...) their stripes fade almost completely. When they're alert or angry their stripes get very dark.
Not the same thing. That is most likely learned behaviour which is not the same thing as understanding warning signs of threat displays. And I was talking in general terms as there are not set in stone answers. In general, community fish don't understand the simple threats from cichlids. Yes, they can learn from being chased away many many times where another fishes territory is but they still may not understand the simple threats of warning beforehand that would preclude any nipping and chasing.
Also, if your angels have a certain area they have as territory and when chasing others don't stray away from that area, it will help the other fish know to stay away from that area. That doesn't mean that community fish understand threat displays as well as other cichlids, because they don't, that just means they know to stay away from a certain area.
Edited for smiley. It looked like I was mad or something without it.