
Originally Posted by
Nicky
It seemed to say that ADA uses the overflow to ensure there are plenty of O2 for the filtration process.
With this I believe they tried to imply that O2 is an important element for filter process and is actually good to avoid algae problem.
Then before the water gets pumped from the filter back to the tank (through the UV etc) the CO2 is injected directly into the pipe leading into the tank.
This somewhat change the paradigm some of us have, that using fully enclosed cannister is the way for planted aquaria.
You save CO2 by having an enclosed system but then again, you can always add some surface movement to add some O2 in from the atmosphere to prevent a depletion. Now, what does plants add during the photoperiod? Several airpumps running non-stop will not even match the amount of O2 pump in by plants.
Regards
Peter Gwee
Plant Physiology by Taiz and Zeiger
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