Urgent help!

[Blu3s94]

So I just came home to my lavender tang having 2 huge spots on him. Attached pictures. He is swimming fine, have had all my fish for 1+ year no problem but did recently add a mandarin goby. Is this a disease? Injury? All my fish are tangs except a foxface, wrasse, and goby. Is it possible my foxface stung him??

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[Cancun]

Hi! Sorry about your Tang....too me that looks like a injury.....it has been yrs ago but I had a foxface sting s Yellow Tang before, and the markings look similar.....just my 2 cents....

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[asmodyus]

You need to treat him with furan 2 asap

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[Blu3s94]

Do you know what it is? I only have prazipro on hand. Would that work? Reef safe? Only thing I can think of is the mandarin goby or a coral frag introduced something into the tank. Its the only "wet" thing that has been added to the tank in over 1 yr

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[lagatbezan]

Can you post a pick with just the white lights on and no blue?