Frustration

[WhoPoopWrasse]

After all the money your system cost you, setting up a QT is your next best bet. It will save you soooo much heartache and frustration.
As Marie said, you now need to leave your tank fallow for 6-8 weeks because it is most likely infected with brook, ich or velvet. In the meantime set up that QT, cycle it (adding a small piece of NEW liverock will speed it up a bit but take it out before you add the fish)
and buy your clowns and keep them there for the duration. That way your tank will be clean and if your new clowns are sick they'll be in the right place for them to be treated.