Steve Mendez wrote:Since this is for occasional, mostly intentional power outages, maybe the simplest and least expensive solution would be a bottle of oxygen with a regulator and a solenoid switch that would open when the power is interrupted. The oxygen would be added to the fish tank through an inexpensive air line hooked up to an airstone.
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2019 PDC for Scientists, Engineers, Educators and experienced Permieshttps://permies.com/wiki/100059/PDC-Scientists-Engineers-Educators-experienced