Rcguerra
Aquarium Advice FINatic
Regardless of the temperature you have, I strongly recommend having a heater in your tank. The glass around the water is a good thermo-conductor, and as minor temperature changes occur, the variation takes place quickly into the water. I have been breeding bettas for a while now, those with heated water present better color, better (active) behavior and live significantly longer, even in Florida (where I started breeding them).