How long does it take for copper to kill ick?

[blubutterflyz]

How long does it take for copper to completely wipe out ick? I've treated all my fish but my royal gramma and tang are the only ones showing signs. I only treated last night but they are already showing improvements. They were covered in spots yesterday and are looking alot better already. I'm using CopperSafe.

 

[slofish]

From what i hear, 3 weeks is a good time period to leave your fish in copper to cure ich.

 

[beth]

Are you using Coopersafe in your main tank? Be sure to follow medication instructions and don't overdose.