OH GREAT... NOW WHAT

[Skimmin]

So I bought a Chevron Tang about two months ago. I put him through QT and now after being in my display tank for almost a month has been fine. Now tonight? ich... To make matters worse I picked up two new fish to put into quarantine toninght.... Now I guess I have to get all the fish out of my tank... 300 GAL TANK...... or I guess I'm gonna get rid of my corals, inverts and anemone etc.... and hypo the tank... Any other ideas for what to do would be great... Everything else in the tank seems healthy with no spots but I know if its in the water with fish its always gonna be there right?... So frustrated. This is the first tank I've ever had that I actually QT my fish. This is also the first tank I've ever had ich show up... I'm also running a uv light...