So why do you have to use more copper these days to kill Ich than was used to kill it 30 years ago? And for that matter Velvet too?
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Why is it getting more resistant? How is it getting more resistant?
The ich and velvet in the ocean isn't being treated in the ocean with copper to kill it so ich and velvet coming in with a fish from the ocean isn't more resistant to copper.
Where is this resistant ich and velvet coming from?