Check out the health conditions of the fish carefully. If you are observant enough, you can check out both visible and intrinsic health conditions of the fish. First, you must observe the body of the fish. Pay attention to the scales and the fins. The scales should be shiny and smooth, while the fins should not have any cuts or nicks. If there is some fuzzy growth on the body of the fish, it is better left alone. Also check the areas under the eyes for any telltale health signs. Some fish would not 'look' ill, but they might have internal conditions. You can tell that if a fish is either too sluggish and spends most time at the bottom of the tank, or if it is hyperactive and keeps darting everywhere in the tank in a sort of frenzy.
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