I would suggest you check your own advice and do some research. Temperatures of less then 67 or 68 degrees is cold enough to cause hypothermia in bettas, increasing the risk oif illness and death.RandomWiktor said:Regardless of what you put your bettas in now, make sure that you have control of the water temperature in your new bowl or tanks. Temperature's of 65-80 with the 70's being ideal is the best temperature for these guys, though they can survive in lower.