Question from: D via email: Hello, I was wondering what fish are good tank mates for Bettas. And if it makes a difference if it is a female or a male. Hi D. I don't think it will make a difference if it is male or female. If you have a heater in your aquarium, some good tank mates for Bettas are Plecos, Corydoras and Neon Tetras. I would not recommend Angelfish, Gouramis, Silver Dollars, and some of the larger Tetras. Also, don't have more than one Betta in your tank, otherwise they will fight constantly.