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Re: CO2 Comments
Regarding the discussion of cba growth near filter outflows, or on filter
return ramps- if it is true that some, many, or all types of cba are
supressed by O2, then here's a thought on why they might grow in these areas:
I don't know how much of a difference it makes, but unless a filter
aerates the water prior to returning it to the tank (as some types do),
wouldn't the water coming out of the outflow be lower in dissolved 02 than
the water going into the filter, because of the oxygen-consumption by the
nitrogen-cycle bacteria, and decomposition of organic matter taking place
within the filter? Couldn't that be the water with the lowest 02 content
anywhere above the substrate, in a well-circulated planted aquarium?
If so, then the filter's outflow ramp, or the surfaces just in front of a
submerged output jet would be under a different condition than an average
spot in the tank. If, in a particular tank, conditions were such that cba
was barely kept at bay elsewhere in the tank, could this difference be enough
to allow it to grow there?
Zach K