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Re: wet-dry filter and co2

>>If you are using a wet-dry filter on a CO2 injected
tank, and you left the wet-dry open to the room air,
you would lose most of your CO2.  But then
if you sealed the wet-dry to keep CO2 in the water,
wouldn't this defeat the purpose of using wet-dry? 
After a short time, with carbon-dioxide injected
water trickling through the sealed filter, the chamber
would fill up with CO2.  The water would be coming in
contact with CO2, not oxygen.<<

I think this issue exists independent of wet-dry
filters, since many people inject co2 directly into
their cannister filters, using them as reactors.  One
wonders if the relatively high levels of co2 in these
cannisters limits the effectiveness of the biological
filtration, since it is generally accepted that they
do better with higher oxygenation.  On the other hand,
high co2 and high o2 are probably not mutually
exclusive.  In a planted tank, you probably have a
greater than normal o2 level.  But regardless, it is
possible I suppose that high levels of co2 could be
inhibitory to nitrogen-related bacteria.  I don't know
that anyone can answer this definitively, without
doing some cycling experiments using added ammonia. 
Maybe someone without fish can measure
ammonia-handling 1) without co2 injected into their
filter, and 2) with co2 injected into their filter
(this being performed second).

Of course, in a sense, the debate is moot, since
planted tanks do not require much in the way of
biological filtration in the first place.  But still,
enquiring minds want to know...


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