Spot identification on Convict Tang

[ohaverd]

Injury or something else?

 

 

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[DFR]

My guess would be injury, especially if it was recently introduced to the system.

[Jon Lazar]

Probably injury.  I would try to fatten the fish up though.  You shouldn't be able to see the fish's spine.  Keep nori in the tank so he can graze all the time, and in a few weeks he'll be a healthy weight.