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1. When keeping aggressive species of fish, it is best not to introduce peaceful species of fish among them.† Aggressive fish will tend to bully the more peaceful fish.† Make sure to thoroughly read about the compatibility of the selected fish for the aquarium.
2. Catfish sometimes require freshwater as juveniles and then as they get old they will need a more brackish environment.† Make sure you read up on your catfish to learn what its needs will be when it gets older.
3. It is generally a good practice to purchase the largest aquarium that you can actually afford.† A larger aquarium will be less susceptible to quick changes in the chemistry, and will offer much more stability.†
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