Hi Nancy,
I have to totally agree with Brian and Dawn. Copper especially (above all other metals), in a high enough concentration -- and it doesn't take very much -- is highly toxic to all aquatic forms. Whoever told you that copperv pennies would kill your little snails was absolutely right, but also irresponsible for not telling you that if left in the tank just a little too long, and allowed to dissolve just a little bit more, it will kill eveerything in your tank -- and unless you continually test for it and know exactly at which level it becomes toxic to everything beyond snail (which would include all other invertibrates), your fishes will be dead. It's like you taking arsenic in small doses. It may not kill you at such low levels, but taking larger quanities of it will surely put you in the ground, as we all know it's toxic. So where do you stop, or for that matter, why use it at all?
This belief of using copper (and it was a viable belief if done knowledgably) for certain aquarium applications goes back to the earlier days of the hobby. Aquarists would use copper pennies in their tanks to cure Velvet disease, and it worked very effectively. But, it was also well known that it was dangerous to use as it was not only uncontrollable but difficult (if not near impossible) to know when leaving them in just a little too long -- and there was no set time to know how long to keep the pennies in as they dissolve at different rates depending on each aquarium's different pH levels. There were no copper test kits back then to monitor it's level. Many fish being treated for Velvet were lost due to the aquarists taking these risks.
Ray
--- In AquaticLife@yahoogroups.com, Nancy Lee wrote:
>
> I was told that copper pennies would kill the little snails.
>
> What would happen if clean, boiled, change [$.10, $.05, would be put in a tank. The new pennies look great. Not having any trouble with my guppies at all so far.
>
>
> [Non-text portions of this message have been removed]
>
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