Bettas and corys

At least 2.5 gallons, IMO. I keep my two corys and male betta in a 4 gallon and do water changes 2x a week. You'd probably have to do even more than that if you had them in a 2.5 gallon.
 
It's better to keep a larger group of cory's, they aren't real shole fish but they do like having several members of they're own species around.
 

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