OK... so if you live on the Eastern Seaboard and hae gotten over your earthquake, you now must prepare for a hurricane. My question: How do most prep their tanks for power loss if they don't have battery powered pumps. I have 2 goldies in a 45 and two smaller ones in a 20gal. How long will they last without filter and airstone oxygenating the water? Can I manually stir/agitate the surface of the water? (I know I can... but would it help?)