Stringy Acros HELP!!

[DunkCityReefer]

A few acros have some weird string coming from the polyps. I did not feed and dipped the corals that had the most string and no pests. Kind of stumped on this one. Anyone have any ideas?

 

[oscarinw]

It's hard to see from the pictures, but look up "mesenterial filaments" on Google.
If so, nothing to worry about.