I always quarantine my fish with 2-2.5 ppm copper safe for 1 month and 2 weeks observation. Although I have only done this for 3 rounds of fish, this has so far never failed me.
But now I have a purple tang for 2 weeks in QT with 2.4 ppm copper safe (Hanna tested), and he shows the typical signs of ich. He's in a good shape though. I am so puzzled! There are some anecdotal reports for copper resistance, but really??
If this doesn't work, what is the next approach? Hypo-salinity? @Jay Hemdal?
Cheers,
But now I have a purple tang for 2 weeks in QT with 2.4 ppm copper safe (Hanna tested), and he shows the typical signs of ich. He's in a good shape though. I am so puzzled! There are some anecdotal reports for copper resistance, but really??
If this doesn't work, what is the next approach? Hypo-salinity? @Jay Hemdal?
Cheers,