How many fish do you have?
How large is the tank?
How many overhangs do you have for them to hide under?
Is the lighting dim or very bright ?
Catfish often play and chase each other. As long as they're not doing damage they should be fine.
Fish typically only tightly school in the presence of a predator. Also in order to get true schooling behavior you often need very large amounts of the same fish which you usually will not see in aquaria.
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