I think you did the right thing. I know a lot of people see a fish freak-out in QT and immediately think they need to remove the copper. I would highly advise NOT to do that, because often it’s the only thing keeping the fish alive.
Foxface are known for their sulking. I would try not to worry too much yet, just keep a close eye on ammonia and add as much O2 exchange as possible to help him breathe. An acriflavine bath might provide some relief and help ward off infection as well.
If the tang is swimming in the powerhead, it’s a tell-tale sign of velvet. I’d be prepared to move the rest quickly, just in case.
Foxface are known for their sulking. I would try not to worry too much yet, just keep a close eye on ammonia and add as much O2 exchange as possible to help him breathe. An acriflavine bath might provide some relief and help ward off infection as well.
If the tang is swimming in the powerhead, it’s a tell-tale sign of velvet. I’d be prepared to move the rest quickly, just in case.