jumping from 69 to 86 in less then 1 days time is a large jump for any fishMoontanman;3622351; said:I catch red fin pickerels in water above 86 degrees all the time in the wild. More likely the tank wasn't aerated enough and the oxygen concentration went down due to the temp. I don't like to keep any fish that warm but I see no reason the temp could have killed the fish with out other causes coming into play.
