Help with ID

[WillReef4Food]

Yesterday I noticed one of my female anthia was behaving abnormal and a white discoloration around some areas of he body. I tried to catch her, but it was too late as of this morning. I took some pictures and would like some opinions on confirming the cause. It looked like Brooklynella but when I pulled the fish I could see missing scales and some fin shredding so I am thinking it might be aggression? I think I got to it before the shrimp did.

History wise, it was a group of 4 females and 1 which turned Male (5 total). They have been in the tank for nearly a year and were introduced as all females initially. Last fish added was a naso tang about 2 months ago but no agression has been observed by myself except for the normal Male Anthia tending to his flock.

 

[Humblefish]

More likely a bacterial infection. It's unlikely brook would remain dormant for 2 months since the last fish was added.

 

[Picturesque Aquatics]

I would have to go with humblefish, its doesn't appear to be fungal.

 

[WillReef4Food]

Thank you. Hopefully its an isolated case, I'm currently monitoring the rest of the tank and luckily it does not seem to be spreading.

 

[ebushrow]

kind of looks like missing scales in the photo....it is possible it was just harassed to death?

 

[WillReef4Food]

Yes, they are missing. It was not obvious while I was trying to catch her but once I pulled her out, I could see sections of scales missing and some fin shredding which lead to my thinking of aggression, after the fact.

 

[Humblefish]

Very possible. Harassment which inflicts damage/wounds, which then gets infected. Most of the time a fish's natural immune system is capable of handling infections on it's own, but sometimes not...