Most stressful fish I've ever owned - achilles tang

[Skimmer Juice]

Chin di you try cupprimine? It is not nearly as harsh as copper. I used cupprimine on my lnghorn cowfish, wich are believed to be very hard fish to treat. I have also used it on my mappa puffer, you should try this method in a qt tank, it has never let me down. Good luck with the fish, I hate when I have a sick fish, nothing worse.