I had posted awhile back about in case of power failure how do you power your tanks. I had a great answer by blue belly. Using my 75 gallon with 5 golds and a can and hob filter, air pump...as an example. In a perfect world, these things can be powered up by generator or car, etc and run until the power comes back. But everything isn't always perfect. If I had to ration out power, how much and how often do I need to temporarily power these things, filters/air, up to keep the fish ok? I had wondered if there were a battery powered submersible pump that I could drop in there to help with sitrring the water to increase oxygenation. But I couldn't find one.