yellow tang has red streaks on his body

[loyalty]

i thought i'd come here before i launched an intense web search...my tang has red streaks along his main (if he was a shark) fin. he seems to be eating fine, but he is especially skiddish of late when there is traffic in front of the tank. any ideas?

 

[Mikeyjer]

Fin rot infection! Due to poor water quality. Good quality food, algae sheets, frozen formulas, etc. should fix it up and it should heal over time.