Have you made any attempt to treat these fish in a HT/QT? I'd do some research, identification fish parasites is important stuff to know. Regardless of what it is; I wouldn't get new fish until you have an established QT and are ready to use it. These big fish losses can usually be prevented with a QT.
Re: Your Cuprazin question. I can't comment on a med without knowing what the parasite is. But with this product, I'll make an exception. This stuff claims to do everything; IMO & IME, these products that claim to do it all don't do anything.
If you have any chance of saving your fish; you need to find out what parasite you have and get a HT/QT set up ASAP. If you don't use a QT with all new fish, this is bound to happen again. Can you post a pic? I'd Google "marine Brooklynella", "marine velvet< and "marine ich" Include images and see if you can tell us what you're dealing with. However, if your losing fish fast; it could easily be "clownfish disease" (brooklynella). This is nasty stuff and can quickly wipe out a tank.
There are a lot people here who are wiling to help; but we need a whole lot more from you
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