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If you're going to go with a tang in a 55, go with a Ctenochaetus tang. They are the smallest tangs out there, I believe. A Tomini Tang is quite pretty if you ask me and they are usually reasonably priced.
If you're deadset on anthias, go with a smaller species like the Bartlett's or the...
Check out the National Fish Pharmacy.
Get their product called "Crypt-Pro". It's Quinine Sulphate. I would never, ever copper tangs, angels and anthias -- and it sounds like you're going to remove them from the display.
IMO, Hypo is pretty much bunk. You're stressing the fish out even more by...