Fluke damage can cause secondary infection. If this is the case, you may need to find a way to capture the tang and treat it. Mose antibiotics are toxic to reefs.
The ulcers that you mention could be the result of a bacterial infection and it will start to erode away at the wound.
The flukes typically attack the fins and make them look ratty. They also make the eyes look cloudy.
Is the tang starting to look ematicated? Is his lateral lines starting to show and is he still eating at all?
The main priority is to maintain his ability to eat. If he still can, feed him lots and often so that he has the energy to fight off the parasite. Once the fish stops eating, you basically only have a couple of days before it succumbs.
Hope you're no where near that stage yet.
Careful on dosing the Prazipro when you get it tomorrow. Although difficult to overdose on that stuff, it can still be done. Watch your inverts.
Paul
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