uhhh,I'll have to disagree and say no other fish unless he's in at least a 10 gallon Bettas don't get depressed for fish of other kinds,they actually would rather have a betta neighbor IMO. That's how they grew upwrs said:thats nice, and if you get a kritter keeper, you can get him a friend, like some catfish or so, because they can get depressed by them selves. the 5 gallon ones are 11 dollars.