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Hi Roddy,
There is no way that JR could manage as well as you if he had 1/16th the filtration, and still have the same water quality. The water throughput won't affect ammonia and nitrite anything like as much as you imply. I would imagine that the filters remove ten times more ammonia each week than the water change would remove. If JR decided not to change a drop of water in a given week, he wouldn't experience a significant rise in ammonia or nitrite levels. But, if he removed the filters, and kept feeding in the same manner... the levels would go sky high.
Mike.
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