I am the keeper of one of the WMAS loaner fish traps.

There are quite a few things that can be done to help our pet fish be more peaceful, happier and better tank mates.

Number 1 on the list is definitely food. Here is something to think about. How do public aquariums get all those different fish to live peaceably together? They feed them generous amounts of different kinds of foods. These fish are always very fat. 

Competition for food is the major reason for aggression. Sometimes the aggression is more about perceived lack of food. Think about what the wild environment is like for a particular fish. What kind of food does it eat there? Research it and then try to provide more of that environment and it's associated food. This will comfort the fish and relieve the aggression. Does the fish eat algae or bugs? What kind of algae? What kind of bugs?

Number 2 on the list also has to do with the environment. As research is done and the specific nature of the wild environment comes more clearly into focus, look at the aquascape for a particular fish. Does it live in open water eating plankton, small or large fish. Does it live in shallow rocky areas and graze on algae all day? Or does it live in a rubble zone where bugs are plentiful because of all the protective spaces between rocks? Does it live in a grassy or thick macroalgae growth where other types of bugs find refuge?

Along with the environment is depth. What depth does the fish come from? Depth changes everything. Not only is lighting drastically different at depth, but different foods grow at 5 feet compared to 60 feet depth.

Please feel free to post a pic and provide some basic info on your tank so that we may provide some real time advice on how to modify it to help the fish feel more comfortable.

Number 3 on my list would be the tank mates and roommates. Some fish feel more threatened, or competitive, or aggressive around certain other fish.

Why Roommates? Is there clutter on top of the tank (shadows -> shark attack!) and surrounding it. Maybe there is a lot of foot traffic or a child bangs on the glass constantly frightening the fish with sonic booms. Absence of these last things lends to a calm peaceful environment with happy fish.

Number 4 is that the fish simply needs to be trained. I have said a lot about this many years ago in the thread linked below. This "fish training" is not simply theoretical. It is a well worn tool in my "bag of tricks."  IMO, fish are about as intelligent as dogs. They can be conditioned to get along. http://utahreefs.com/forum/forum_posts.asp?TID=34014" rel="nofollow -

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I looked back a few months in your history of posts. I didn't see a pic of your tank but I did see a pic that gave me a hint of a reason for aggression in the Coral Beauty. I'm also curious about your reasoning for the removal of Stomatella Snails? I believe it would help us to help you if we could see a pic of the tank and if there is one, the Sump/Refugium.

Aloha  

Okay, others may disagree but here is what I saw in this pic:

Mostly white sand and no detritus. There's nothing much there for the Coral Beauty Angelfish to eat. I would really need to see a full tank pic showing all the LR and aquascape to verify my hint and give some hopefully helpful advice.

It's actually a good thing to decrease the Stomatella population so there will be more soft algae gowth for the Coral Beauty to eat.

Aloha,

Mark 

Mark, that pic was from when the tank was set up brand new.  Trust me, now I have tons of detritus and my wife complains about dirty sand.  The fuge is growing bugs really well and the parameters of the water are on point.

Marcoss,

it is a cadlights tank.  I had the bracket custom made by a guy I work with.  it's made of 1" aluminum, welded together and I anchored it to the wall studs behind the tank.  I was nervous about hanging a 48" T5 from the ceiling, so I went that route instead.