[traveller7]

Quick reactions in this hobby are almost always bad reactions.

Glass tanks are easy to clean out after hospital use, it is a good idea to have one on hand.

Siphon half of the main tank into the hospital tank and move the clowns.

Top off the display with saltwater that has been mixed to proper temp and specific gravity.

Over the next few hours, top off the hospital tank with fresh dechlorinated water of proper temperature.

Don't move sand, rock, inverts, unless you are absolutely certain there is something wrong with them.

Keys now, are stability and feeding for the clowns, and dropping the specific gravity to a level which prevents the parasites from reproducing.

This is a battle of attrition and patience, but 100% effective if performed properly.