Puss wart/pimple on head of butterfly

[Pattyj]

Hi, I have a Copperband Butterfly fish, newly acquired into my tank and has developed a pimple like spot on the right side of his head. I've kept a persistent worried eye on him for atleast 5 days and he doesn't seen to he acting anything strange, just timid but active and feeding. Just now I noticed his pimple had burst and now a white like substance is hanging off but still leaving this pimple behind. Do I need to act now and work on getting him out of the tank to treat him in a quarantine tank, or let him be and hope he can just live thru with no drama.
I've attached a photo so if anyone can help or at least give me an idea where to look for ideas I and copper would be very thankful.
Cheers

 

[R33F FeTiSh]

By now I would say trying to catch him will only stress him out and possibly kill him. Just make sure he's fed well is all you can really do now. And butterfly fish are extremely sensitive to copper treatment so never treat them with it.

 

[slitherbomb]

It's going through puberty! It's becoming a grown butterfly fish lol

 

[Pattyj]

yeh I will not be trying to catch, and I assume he is eating enough because he grazes the live rock all day long and I'm sure he's eating some of the stay krill I feed my coral/anemone. Thanks for the insight and I will let it known if it progresses into anything worse.

 

[slitherbomb]

My clownfish had this. After it "popped", it went away. As long as it's eating, don't even worry about it.