Duncan Help!!!

[Newbie Fish]

Hi guys

I just got a new Duncan coral with about 15 heads last week. It was doing alright, but today I got home and noticed that the tentacles were not as spread out as normal, and that most of the heads seem to be spitting out a stringy brown goo from their mouths. Is this normal or am I in trouble? There is no skeleton showing and the heads aren't retracted all the way.