Nothing. All meds will either not work or kill the corals/inverts You have about 4 options.
1) Move all the fish to QT and treat there, returning to the display after 6-8 weeks of being healthy (prefured option)
2) Daily freshwater dips (second last option)
3) Moving all fish into a bucket of salt RO, and changing over buckets every 24 hours. The bucket and equipment will need sterilising between fills, and an airline and heater are required in the bucket... Every time yo umove across to a seporate bucket, you start with a fresh salt mix... (second choice)
4) Sit back and watch the disease run it course (Least disireable choice)