Please help, red spot on blue tang

[alexmalam]

Hello, as the picture shows I have a blue tang with a red spot on its tail, the photo is from yesterday and it seems bigger today, is this a wound ?

Can it be a disease ?

It’s not a new fish, I have had it since 2016, like most of my fish. I added 3 more fish one month ago after a 3 month quarantine.

Any advise ? Does anyone know what this is ?

 

[vetteguy53081]

Hello, as the picture shows I have a blue tang with a red spot on its tail, the photo is from yesterday and it seems bigger today, is this a wound ?

Can it be a disease ?

It’s not a new fish, I have had it since 2016, like most of my fish. I added 3 more fish one month ago after a 3 month quarantine.

Any advise ? Does anyone know what this is ?

Looks like a wound or injury which is infected and best treatable in separate tank using Seachem Neoplex or kanaplex with added aeration

 

[Jay Hemdal Verified Community Expert]

Hello, as the picture shows I have a blue tang with a red spot on its tail, the photo is from yesterday and it seems bigger today, is this a wound ?

Can it be a disease ?

It’s not a new fish, I have had it since 2016, like most of my fish. I added 3 more fish one month ago after a 3 month quarantine.

Any advise ? Does anyone know what this is ?

Is it mostly on the left side of the fish?

Growing larger is a sign of possible bacterial infection. Agree that you could move the fish into a treatment tank and dose with a broad spectrum, gram negative antibiotic.