David F wrote:
Yesterday there was a power failure and my aquarium temperature rose to
nearly 30 degrees C (90 F) The forecast is for a prolonged hot spell
with temperatures in the high 30s (degrees C) = 100 degrees F

The local pet shop owner reported that the fish jump out of her tanks if
it gets too hot.
Any suggestions on how to manage an aquarium during hot weather? (with
or without a power failure.)

David F

I would probably do a 25% water change & add water that is around 75
degrees to your tank, that way the warm water will balance out and cool
it down without shocking the fish.. When the power is on keep on the
air at a cooler than usual temp so the glass/acrylic will not absorb
the heat as much..

When you have an outage, try the above with the cooler water and it
should take awhile before the water gets too hot again..

It worked for me in the sumer, so hope this helps you..