wrote in message
ups.com...
I need to know if galvanized steel with zinc in it is ok to put in
fresh water tanks with fish and plants in them? The reason why I need
to know is that I am occasionally using a vortex diatomaceous filter
(xl model) and I only have had success by using hose clamps made out of
the previously mentioned metals.
snip

I guess no one remembers when aquariums were held together with
galvanized iron frames (or aluminium or stainless steel if you had deeper
pockets). I remember glass tops falling into the water because so much
of the iron lip had rusted away. Zinc salts (galvanized iron) have been
reported as poisonous to fish, however for the occasional use you are
suggesting, I would be sceptical about its harmful effects. Whatever
effect it would have would be magnified by how acidic your water is (low
pH = more leeching) so ymmv.
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