300G DD with 15 fish roughly. Tangs, gobys, angel etc.
Tank had ICH 2 1/2 months ago due to a new addition, a lieutenant tang. I know I know I should have QT'd the Tang.
Removed all fish, treated with copped safe for 3 weeks in a 36G QT Tank. Then made water changes to the QT tank for the next 3 weeks. At the last 2 weeks I used the main tank water for changes for acclimation.
In regard to the main 300 tank I added kordon rapid cure and treated for 3 weeks, raised temp to 81. The reef was fine with the tratement, no loss. After water change I ran my emperor HO 80 watt smart uv sterilizer 24x7 for two weeks.