[naesco]

I agree.

I think the secret is to buy first class quality fish.
Too often reefers see a fish they like, one that is not often available or is simply a great deal and buy it and overlook "imperfections".

If the fish is free of spots, tears or redness, is plump with clear eyes take a second look at it. If it appears just as interested in you as you are in it, and actively swimming, buy it.

If not, pass on the fish as there will also be another one available.

Also avoid fish that are problematic like the powder blue tang and difficult to keep species as the chances are that it will get sick and die often taking a few of their tankmates with it.

I treat all new fish with a week of food saturated in Garlic Extreme and avoid putting any LFS water or the net in the tank.