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Thank you. No. I'm not her, but I've had TONS of experience with saltwater aquariums. I do wish you the very best of luck on successfully keeping them. I would definitely suggest putting your next batch in some sort of QT before adding them to your main display.
Not trying to burst any bubbles, but more than likely Its a bacterial infection. Convict tangs, in my many experiences, and humblest opinion aren't really cut out for home aquarium life. Ailments seem to attack them quicker than other tangs. It's just something about them. Like clown tangs, I...