What is this?

[mccarty30]

Got 4 false percula clowns 3 days ago they were doing ok. Just not eating very well. Trying different foods to find out what they like.
Anyways When i woke up yesterday morning i saw this on one....

Well i of course rush to LFS to find no one who has a idea of what this could be. And no advice on how to treat the other clowns so they dont die.

Any idea what it could be?
Or
What can i do and use to treat this.

If there is a medicine i will order it overnighted to me so i can take care of the little guys.

Thanks in advance!

 

[mccarty30]

Oh yes when i got home from the fish store. I found this one dead. Removed it immediately. So i know there's something wrong just don't know what or how to treat the others.

 

[Hattie B]

Hi, they could have a bacterial infection; maybe internal

I would get some Maracyn 2 or nitrofurazone and treat as a start