Can I use copper on a koran angelfish?

[Makubex]

To qt it I heard some angelfish dont tolerate copper.

 

[ISpeakForTheSeas]

I know of at least one Koran angel that was treated with copper successfully (the link below), but @Jay Hemdal any thoughts?

Koran Angel with suspected hole in head disease

Hi guys, I'm brand new to Reef2Reef, and first time posting in a salt water forum. I've kept a salt water tank for years, albeit far from a pro, and probably still a baby in my knowledge level. I have a 100 gallon (non-reef tank) with the system 2 filtration built into the back of the tank...

www.reef2reef.com

 

[Jay Hemdal]

I use coppersafe on pomacanthus angels with no issues at all. I would expect copper power to be equally safe. Both can be treated at 2.5ppm, but accurate testing is important.
Ionic copper can be an issue with Pygmy angels though.
Jay