As have been mentioned, they can be kept higher. If you are getting eggs, the only thing you will have to worry about is how much beyond two weeks it will take the eggs to hatch. ;) All the best! Scott > What temp should I kept Fundulopanchax Gardneri for breeding > > I have no heater in the tank for them right now and temp is 68 F > > George To join the AKA see http://www.aka.org/pages/join.html