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Re: [APD] Caution with lead weights -- Or - Ethyl's Nails
That certainly argues against lead being the culprit if someone loses
a tankful of fish. I would expect lead poisoning to affect different
fish and species of fish at different rates, so a lead poisoning
problem would be a long drawn out series of fish deaths. Also, lead
oxides are insoluble in water, and the lead strips I use tend to be
heavily oxidized. One last comment: (I know that anecdotal evidence
is not good evidence, but) I kept several fish, from clown loaches
to SAE to Chinese algae eaters for about 4 years in a tank that had
quite a few lead strips weighting down plants. There were probably
about a half dozen of those strips in the tank at any one time, since
I tried to remove all of the old ones at every opportunity. I had no
problems at all with those fish.
If I kept expensive, long lived fish, like Discus or even angel fish,
I would avoid any lead in the tank, but for the very small fish I
keep, which tend to live about 2 years (guppies, for example) I don't
see where there is a problem. In any case, there is no question in
my mind that avoiding lead in the tank is desirable. I just don't
believe that people lose a tankful of fish due to lead in the substrate.
On Sep 27, 2006, at 11:58 AM, S. Hieber wrote:
> Lead doesn't have to dissolve quickly to to be toxic. The effects
> are cumulative over the lifetime of the organism so low prolonged
> doses can add up to trouble -- iut'st he totatl exposure that counts.
> Btw, some, if not most, of those lead weights nowadays are actually
> zinc weights.
> Lead or zinc weights can corrode in hard water, too. When oxidized
> and mixed with a suitable liquid binderl, lead makes a terrific
> white basee for paint.
> At what levels are either zinc or lead harmful to fish? It's
> somewhat controversial at what level they are harmful to humans,
> much less fish. But it's harmful enough that the Petro industry
> decide many decades ago to go with "Ethyl" as the name for the
> gasoline additive rather "tetraethyl lead" or the simple "lead."
> If you use iron-bearing product for a weight, you cn consider
> yourself slowing boosting the iron trace levels in the aquarium.
> Some folks bury nails for that reason only. Others bury nails in
> backs for fun or profit, but that's entirely different.
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