My apex would send an email & txt when communication is lost......
Then I have T - however long to get my inverter running....
I had the power go out like 3 years ago for 4 or 5 hours and everything was fine (I was on vacation when it happened and my tank sitter was unaware). I think it depends on a few factors.....
Number and size of fish, volume of water & outside / room temp..... As well have a back flow / check valve so your tank doesn't all run into a sump that can't handle the increased volume.
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