Anyhow, no matter how hard I tried, I could not catch the tang. I gave up when someone else on this site mentioned Stop Parasite, which is also reef safe. I went and bought some and started treating. Our yellow nose starting hanging at the surface and I felt that I should try and catch him for quarantining. I was able to and moved him to the quarantine tank. Actually, prior to that, I had called the number on the bottle of Stop parasite and got the owner. I had heard he was really helpful. He was great! He told me to go get some Melafix and start using it with the Stop Parasite. He cautioned against removing the fish because of the stress that it can cause the fish. But again, I was trying to listen to everyone else and when I had the chance, moved the longnose.
The end of the story goes like this.....the long nose that we moved, he died during the night. We kept the tang in the dt and continue the Stop Parasite and Melafix, and she completely recovered. The theory that the maker of the Stop Parasite has is this.....ICH comes from stress, moving the fish gives them stress, if you can safely treat in your dp and avoid the movement stress, then why not do it that way. He developed this product for that reason. I had a minor outbreak with another fish that came later and started the Stop Parasite and he recovered quickly with no further treatments. I know this is contrary to the popular belief that you should quarantine, but like I said, I would never have been able to remove my tang without dismantling my 100+ pounds of live rock, thereby stressing the tang and all others. When I get a new arrival, I treat the tank for 3 days with the Stop Parasite and all has gone well. You can also use it as a maintenance, which I am going to start doing. Several of the online stores carry the Stop Parasite, and the owner is so helpful and very concerned. He called me every day for several days in a row to see how my fish were doing. Good luck!