Re: [APD] Excel and U.V. light

["S. Hieber" <shieber at yahoo_com>]

This is a topic I've been wtaching and asking about for a
few years now. There doesn't seem to be much evidence that
UV units cause iron deficiency in planted aquaria.
Chelators are usually relatively unstable compounds to
begin with (at least EDTA), so it might not matter that
much if UV rays speed the process along. Otoh, it could be
that ferrous or ferric, in a planted aquarium, it doesn't
really matter that much; there's enough going on for the
plants to get their fill.

Scott H.



--- Raj <ggrk at blr_vsnl.net.in> wrote:

> 
>          U.V. light causes a lot of chemical bonds to
> break down. As I 
> understand it breaks down "chelation".
> 
>          The reason for adding Chelated compounds to the
> aquarium water is 
> to prevent the wanted metal from being oxidized rapidly
> and unaccessible to 
> the plants. A chelated compound breaks down slowly and
> releases the wanted 
> form of metal over a longer time. Thus benefiting the
> plant.
> 
>          U.V. light would break down the compound (&
> chelated nutrients) 
> rapidly and thus exhaust it quickly.
> 
>          Am I wrong?
> 
> Raj
> 
> >I read on another site that Seachems Excel is broken
> down by U.V. light and
> >that if you want to use it you need to turn off your
> U.V. sterilizer.
> >
> >Does anyone now if this is fact?
> >
> >Thanks,
> >Bill VanHorn
> 
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> 


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