Reply To: Deaths. Welcome to the website! › Forums › The Celestial Pearl Danio › Behavior › Deaths. › Reply To: Deaths. August 5, 2007 at 9:05 pm #11780 ste12000Participant Its hard to lower it when the temperature is warm outside, Mine is at 82f today and the heater has not been on. Mine have been spawning today so 80-82f is certainly enough to get them breeding.