Ask any hobbyist and you will hear the same answer. Fish have distinctive personalities, just as humans do. Some get along swimmingly with tank mates and others show hostility and aggression towards them.
Some are happy to share their space and others try to claim the whole space for themselves.
Into a calm, settled and friendly salt water reef tank, add a beautiful Raccoon Angelfish. Not only does that angel never stop swimming, but he does it an agitated manner. I’m sure it causes stress and rising blood pressure levels among the original members of the tank.
He looks pretty but his personality soon detracts from his looks. Although his looks may be  pleasing, his destructive eating habits start exhibiting themselves. He immediately starts nibbling the coral. Not the algae on the coral, the way the other fish do, but the actual coral. Given the opportunity he will decimate the coral structures within a matter of weeks. The tank will resemble the sad dying coral structures of the Great Barrier Reef of Australia.
In the name of peace we make the decision to send him back to the store he came from. The Angelfish is unceremoniously scooped out of the tank and placed on a holding tank, where the owner of the fish store will pick him up and sell him another hobbyist with fewer underwater real estate issues.
We wish him well in his new home, but are grateful that harmony is restored to the peaceful, established tank that was there before the invader came along, and will hopefully remain that way for a long time.
MorristownMemos 
Comments on: "FISH ARE PEOPLE TOO" (10)
Reminds me of a song from back aways: https://youtu.be/7qaf5RAV1Ls
Lovely story. Would be so nice if we could return stressful people to the aquarium store too!
If you find a way to do that you could patent the method and become a millionaire.
Glad the Angel fish didn’t tweet after he was yanked out of the tank.
Jerry
Could you be confusing birds or our president with fish?
Glad the Angel fish didn’t tweet before he was yanked out of the tank.
Jerry
calm and peace have returned to the saltwater reef tank.
Ronnie and I wish the same for the rest of our world that exists outside a fish tank
Harvey
Wouldn’t it be wonderful if solving the world’s problems were as simple as removing one small fish?
Sounds like quite the aggressive eater. Thank goodness he didn’t decide to nibble (gnaw?) on the other fish!
Nah, they’re too soft for his taste! He prefers the rock hard coral.