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Re: filterless tanks
In a message dated 1/23/99 1:52:10 PM Mountain Standard Time, Aquatic-Plants-
Owner at actwin_com writes:
> between .1 - .5 (am color blind and it's hard to see the differences)
> When I removed the wet/dry filter (wdf 3000) my nitrates was a bit below
> 50ppm, now they are between 12.5 and 25ppm (I havn't done any water
> changes yet) The plants are doing much better, they are bubbling (or
> boiling as it looks) during the day and the new growth is very
> noticable, overall they just seem alot healthier. The fish has had no
> signs of deficency in o2 as of yet.
> From the looks of this test it would seem to me that the filter was
> robbing the plants of needed nutrients and converting it into nitrates,
Well, yeah, sort of, but not quite. The plants can still use the nitrates,
but they will use ammonia/ammonium first if it is available. And there will
not be an O2 deficiency because of the presence or absence of plants. O2
levels should be higher in a planted tank and drop off at night when both
plants and animals are utilizing it. But I suspect that it would take a lot
of biomass to create a deficiency even just before dawn.
> I may be wrong on this note. This brings up a concern for me, if the
> plants does a better job of filtration than conventional filters .
Not any better at removing ammonia, but definitely a better job of removing or
not even creating nitrates. Filters are needed only when the fish excrete
more nitrogenous waste than the plants and algae in the tank can reuse.