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Step 1
Decide whether you want a male or a female beta. Male betas are the ones with the bright colors that the pets are famous for, but they do not tolerate many tank mates. Females have less bright coloration and smaller fins, but they can live peaceably with other fish in a community tank.
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Step 2
Go to the pet store and watch several betas for a few minutes. Note if any seem to be lethargic. Choose a fish that is energetic, but remember that betas are not highly active fish, so they may not swim very quickly.
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Step 3
Observe the beta when it is fed, if possible. A healthy fish will become quite energetic when presented with food.
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Step 4
Check the fins carefully, especially when choosing a male beta. The long, flowing fins on these fish are prone to damage, and a damaged fin can let in disease. Also, a fish that clamps its fins close to its body is sick, so do not buy one that exhibits this behavior.
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Step 5
Inspect the fish for any noticeable wounds or injuries. Do not buy a fish that has a wound, as these may not heal properly.
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Step 6
Look at the fish's body and see if there are any white flecks or spots. A fish that looks like it has been dusted with salt has an illness known as ick, which can be fatal. Also, make sure the fish's gills are not flaring, as this can be another sign of illness.
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Step 7
Choose a fish that has bright coloring. Dull coloring can mean the fish is ill.
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Step 8
Inspect the habitat where the fish is being kept. If the water is full of debris and uneaten food, the fish has not be well cared for by the pet store. This could mean that the fish is not healthy.
