Thank you! I have reading R2R for a while but never found the courage to ask a question!! I just bought him from LPS 3 days ago. This fish was in a holding tank probably with another 1 or 2 fish.
Blue tangs are famous for the spots that seem to crop up on them. Sometimes they are just a bump mark from when they sleep at night rubbing up against a rock or piece of equipment or from handling during shipping or netting at your LFS.
Sometimes though marks like that can be a symptom of a bacterial infection. Look for white to white-ish filmy area, or redness, or necrosis. Being ready with an antibiotic treatment is a good idea.
For mild bacterial infections can treat with Ruby Reef Rally in the tank.
For more serious bacterial infections, antibiotics may be necessary. Having them on hand is good as often waiting for them in the mail or UPS just takes too long. Here's a thread on antibiotics for you to consider:
Antibiotic treatment What It Treats – Bacterial infections, which are oftentimes “secondary” to preexisting parasitic (and worm) infestations. How To Treat – Follow the directions on the label of whatever product you are using. Always use a broad spectrum antibiotic medication i.e. one that...