"NetMax" wrote in message
...
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.

I remember! I had a tank like this in the late 1970's. It used putty to hold
the glass in the frames too.

I seem to remember the "science" was a lot simpler then too

Oz

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My Aquatic web Blog is at http://members.optusnet.com.au/ivan.smith