What EXACTLY are your parameter numbers?
If your clown has built up excess mucus in its gills from a parasite irritant, a short FW dip should help clear that out and ease his breathing a little while the copper does its job.
Eienna is right, a freshwater dip can relieve symptoms.
Can you tells us exact params as stated above?
Also, can you provide more details about your system and how it's setup & equipment.
A few pics would be nice. Also need to see a pic of the fish and your display to further assess the problem.



