Help - I've Got Ick

[howdy20012002]

I buy a new fish and a week later, my whole tank now has ick.
Sprung up fast and hard over the last day.
I have a cleaner shrimp...but not doing his job
any suggestions on treatment
hear bad things bout the copper sulfate.
Please any remedies would be appreciated before i lose a couple of hundred bucks worth of fish
thanks
Neal