i live in western australia we have just had a heat wave of 2 weeks of 40 degrees celsius (100+). our power went out for three days and the tank heated up that much all but 4 red empress died. i lost 4 electric yellow 3 cobalt blue and 4 acei.

Sorry to hear.....power outages are the worst, especially in our hobby.

Hope you got the a/c back.

Sorry to hear that. Bad combination, a lot of the alternate steps you can take to keep the tank cool (besides ac) also require power.

So sorry about your losses!

A lot of time the heat is not as much of the problem as the loss of oxygen in the water column, so they actually drown. :(
You can use plain hydrogen peroxide in small amounts and diffuse it into the water to raise the O2 levels. Offhand, I forget the amount, but it is fairly small, and in cases such as yours, the risk to the fish, especially at the low recommended levels, is low and probably worth taking.