Whoa, read this and freaked a little since I'm 100 Kms away! Thanks goodness for my Apex.
I still don't have battery backup though.
I have just plugged in a small powerhead into an inverter in my car and ran an extents on cord.
Battery powered air stone is a good option. And as others have said, store the water surface every 15 minutes or so. Depends on your water volume.
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