My fish are all going to die!

Yah, basically you could just vacuum the gravel every day to mimic filtration, then refill, which will help boost the oxygen level too.
 
i would see if i could get a bag of ice and float some of it in a bag store the rest of the ice in a cooler and use a battery air pump with a box filter bigmac
 
Here is a crazy idea. If you have a vehicle and really long extension chords and dc to ac electrical converter, problem solved.

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