This thread outlines the quarantine process you should go through:
How to Quarantine The purpose of this article is to present an argument for quarantining saltwater fish, and then show the reader how to setup a Quarantine Tank (QT) and discuss quarantine protocols. Why quarantine? Setting up a QT does not...
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Instead of the prazipro regiment, you will be using General Cure. They are the same thing but General Cure also helps with internal parasites.
You will still need to go through the copper treatment. I personally use Seachem Cupramine another option is CopperSafe. Your money is much better spent on Copper and a cheap QT setup vs a sterilizer at this time. The treatment process is long and takes alot of patience, but is worth it when your tank is 100% clear and healthy.