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Copper toxicity
I've got an old booklet here called 'Know Your Aquarium Plants' by
Don L. Jacobs, Ph.D Plant Ecology, published by The Pet Library,
no copyright date. It has a listing of freshwater plants and animals
and their relative sensitivity to copper, most sensitive first:
Ceratophyllum plant
Oodinium (Velvet Disease)
Flukes (Gyrodactylus worms)
Vallisneria plants
White Cloud Mountain fish
Ramshorn snails
Corydoras
Platys
Philippine Livebearer Snails
Most other fish
Many other plants
So questions like "how much copper will kill the snails/parasites but
not hurt the plants/fish", like most questions in biology, are best
answered by "It depends".
Btw, for today's handy household hint. When I bought this booklet at
a used book store, the glue binding had failed and most of the pages
were falling out. Such things are easily fixed with a small amount
of aquarium silicone sealant, which makes a nice flexible binding and
is invisible.