Is this mouth fungus?

[neson]

I got a Niger trigger about 6 weeks ago. Four days ago I noticed a mass of pink stuff hanging out of the lower portion of his mouth. At first I thought it was food, because he's a very sloppy eater. But then I realized that it wasn't leaving his mouth. He still eats and swims completely normal, except there is this pinkish crap hanging out of his mouth. It looks like he took some Big League Chew, and never chewed it. The only thing that I can find that looks like it, is mouth fungus, but all I see is white. I can't find a picture of it being pink. I just started the first treatment of Seachem SulfaPlex. My LFS was closed today so I went to a Creature Comforts and this appeared to be the best of what they had. Any ideas as to what it is, and what I should be treating with. I'll have to order it online.

45 gal
Calcium: 400
Sg:1.023
Nitrates: < 10ppm
Phosphates: < .25

Ps, the 45g is a temporary home. I have a 125g cycling now. And he's only about 3 inches.:spin1:

 

[neson]

Also, I have three damsels and none of them are showing any signs of this.

 

[ThRoewer]

Pictures are not clear enough for a definitive diagnosis.

It could be Lymphocystis, a virus infection: Lymphocystis Disease in Fish

In most cases it will be on the fins or the body since it often occurs at small wounds from netting or bites, but it can be everywhere, even at internal organs (where it is often deadly).
The telltale sign are clusters of enlarged cells that create cauliflower like looking clusters.
Usually it will go away by itself after a certain period of time - see linked article.