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Thank you!! It just died (well, the arm attached to the wall broke so I stopped it before it fell completely off). New powerhead should be in by 5:30 pm tomorrow.
It's the fish I'd worry about. Do you have an air pump? Maybe toss an air stone in there until tomorrow. A tank I kept a few years ago was without power for 14 hours and I lost 90% of my fish, and all my shrimp and crabs.