While painting our basement my dad decided to leave the window open and forgot about it over night. The tanks in the room have gone down to about 55. There is a 40 gallon with a jack dempsey, a 30 galon with small mbunas, and a 20 gallon with guppes and gouramis. I have been slowly raising the temperature in the tanks. Im assuming the jack dempsey will live because its nearly a fott long and is still swimming, but the rest are barley breathing and lying at the bottom of the tank. Does anyone have suggestions on what to do? I have never experienced anything like this before.