NEED HELP! Burnaby power outage

[Coasting]

Mmmm our battery backup is down to 30% might not last the night just running 1 little 3w powerhead..... its depleating the power much faster then we thought.
And im stuck on the island....
And the battery airpump wont do a whole lot for a 65gallon....
I feel terrible telling my family to give the airpump to the salt tank overnight potentially condeming my goldfish to death should have bought another pump when i wanted too in july.... #/@^$& uggh.