Whats wrong with my Hippo? Pic!

reefrf

reefrf
I've had my blue hippo Tang from about 60 days now. He is fat & eats almost anything I feed him. Over the last 3 days I have noticed a white streak on his lower back part of his body (where the anal fin meets his body). Does anyone know what this is?

Please help!

Ron

P5290011.jpg
 
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