After using the above treatements I think the best way to treat is a Q-tank w/copper or Hyposalinity, but one additional treatment I have used with success is soaking the frozen foods in a measured dose of Metronidazole - an anti-protozoal compound that helps the fish resist a current infection. I have used M very many times in reefs, with a very good success rate.

In case you were wondering, this is not a new treatment, it has been around for a fairly long time.

Stephen