Originally Posted by IRescue452
Actually, colder water has more oxygen. If you want to have a heater with any fish you must also have something to agitate the water. If you put a strong filter in they might be bothered or injured by it. If you put an airstone in it would be ok, so long as they have plenty of space to get away from the bubbles. I've had bettas live to old age and I don't use a heater. The person on the board is uneducated, its like somebody who says that a dog is aggressive when its growls in play and tells a person to stop playing like that, its best to ignore these people or try to calmly educate them.