Don't give up on the Anthias. Find a good LFS or reputable online retailer to source the best possible livestock for you and invest in your QT process. We have had some good result in my store with H2O2. As mentioned I have used some light doses of CP as well. Some species seem to handle it better than others. Another step in our QT process to mention is that we use a modified TTM so the Anthias that have been exposed to CP treatment are getting a break from it with small fresh doses daily along with the hydrogen peroxide.