> several. Copper is toxic as all get-out for invertebrates.
 DB> Aren't the pennies going to be harmful to your fish? I 
 DB> always thought metal in the water would be harmful to the fish.
Copper compounds are regularly used as a treatment for ick, without harming 
the fish.
Not that I'm suggesting you go and throw in a gallon of cupric acid, mind 
you....
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