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My aquariums on the 6th floor get a water change which is charged with gas. The resevoir downstairs is pressurized with an air pump so that the head can reach 9 floors. (My other tanks are in a basement location nearby).

When I change the water in the 6th floor tank, it fizzes for about half a day. The plants, apprently pearl. I strongly suspect that the mass of bubbles is an out-gassing of the water and is not only a CO2 in O2 out photosynthetic process going on. I suspect that the texture of leaves aids in the formation of bubbles and the general outgassing of a supersaturated solution or CO2 and nitrogen. But I do not have the means by which to test this hypothesis.

Andrew Cribb
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