I don’t know if this is brown jelly it doesn’t really look like it to me but I want to see other peoples opinions. It’s really bad pictures but it just shows what it looks like.
One way to tell is to pull the frag out and smell it. BJD smells bad!
If it stinks, cut off the affected head(s) and dip the rest of the coral that still looks healthy in an iodine dip if you have some.