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Re: Water and algae questions (was Re: [Killietalk] Golden Killies ID)
"Robert Tucker" <tucker at covad_net> wrote:
Exactly. I was being a little rhetorical there. Mark was told the "plants
don't need carbon" and I think what was meant was 'plants don't need carbon
in the filtration system'.
Exactly. The activated charcoal is not available to the plants, may
sequester useful minerals the plants need, and can release adsorbed
poisons at the most inopportune times. Not a good isea, IMHO.
Plants prefer dissolved CO2 which is often in the form of carbonate or
bicarbonate ions, rather than just as carbonic acid, but I think all are
used by some plants, if not all. Some Vals even get a crusty coating of
CaO or CaOH (both fairly insoluble) when the plants have stripped off
CO2 from the carbonate/bicarbonate ions and allowed the insoluble forms
(aka boiler scale) to appear.
PS. Ever notice how KH can drop in a healthy planted tank? It's probably
the plants eating the carbonates and bicarbonates.
Wright Huntley - Rt. 001 Box K36, Bishop CA 93514 - whuntley at verizon_net
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