Patchy white bands on purple tang

tseline

Premium Member
Previously healthy (and still otherwise healthy) 8 yo purple tang developed blotchy vertical bands on caudal body (both sides), no live stock additions for years, other fish (including blue tangs) do not appear affected. What is this?
 

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Looks like some sort of bacterial infection. I would get him out and put in qt with antibiotics.
 
Yeah, I guess either bacterial or fungal infection also. Best to treat in a QT but if you have hardy corals Metronidazole cold be used in tank which would reduce a lot of stress for the Tang.
 
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