Coral poop?

[Imlovinit]

The past few days I have noticed that one of the heads of my three head hammer coral does not like to come out as much as he used to, and not nearly as much as the other two heads. I have just been watching this closely to see if I noticed anything alarming. When I came home today I noticed one of the good heads had two gooey translucent green stringy oozes coming off it's mouth area, and now all three heads are in. Did my coral just poop? Or should I be concerned?