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Yeah, this is really bad. Here's to hoping it doesn't become more common.According to Seachem - its LFS using 'high' doses of copper thats causing resistance. - but in any case - its misuse of copper. FWIW - the first report of resistant velvet was years ago (2011) - and I spoke with the author of the paper - who said - it was in an LFS that was using copper up to 2.7 ppm - but still having deaths from velvet and the only 'cure' was CP. So - I think this has been a problem for some time - as compared to 'something new'. This again is only my opinion - based on my recent research.