Re: metal, on no!

["David French" <davefrench at afo_net>]

The point about the iron helping fish color may be right I do not know, but
the plants need iron in the +2 oxidation state and cannot use the iron +3 in
the rust.


> In India we found that the best colored killies were on iron-rich
> substrates. Ditto the best aquatic plant growth. Your screw may just give
> you an improved strain :).
> As to electroplated screws, zinc is more likely than cadmium (I work in
the
> trade)  except for marine or aero applications. The amount on a screw is
> pretty negligible anyway, the coating depth being about 0.0003"
> The guys worrying about copper from dehumidifiers should remember that
> Scheel deliberately added copper to his tanks to help prevent deseases.
>
> Dave  Wood
>


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References:

• RE: metal, on no!
• From: "David Wood" <dave at dgwood_freeserve.co.uk>

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