Our power was out for 12 hours on Thursday night with the thunder and lightning storm that hit the Lower Mainland.
I lost 90% of my livestock in a 5 day power outage in the big windstorm in winter of 2006. The 10% that survived (including fish) had no heaters and no circulation pumps so they can withstand some pretty poor conditions.
After that loss, I have upgraded in tank size twice. All I have invested in is a battery powered air pump. It is one I got at Petsmart that plugs into an outlet and turns on when the power goes out - it costs less than $15. In the 12 hours, the temperature in my 90 gallon only dropped by a few degrees. Oxygenating the water and keeping a little flow going was enough to breeze through the outage with no problems.
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