Is this brown jelly how do I treat!

[Bradsreeftank21]

I had this hammer for about 5 months, it’s been somewhat retracted for past month or so. Now I notice one of the sections looks like it’s getting brown jelly, how do I treat?

 

[Quoc Vu]

I had BJD before. it will kill every coral it can and will not go away until it has nothing else to feed on. I tried dipping the infected coral but its like once its in the water then its too late. I got my tank infected from a wild caught elegance coral. U introduced something recently into your tank right before you had this issue?