Identification request: Weird mass on Bali Green Slimer

[ESH]

2 Days ago I just started noticing this weird, white/stringy mass growing in between some polyps on my Bali Green Slimer. Initially I thought it was food that got stuck on them, but definitely not that. Any idea what this is? So far I see 3 of them. It almost looks like a bleached, swollen polyp thats curled in on it self, with 1 string coming out.




Kind of hard to show in the pictures, but if you click on the following 2 pictures it has a short video.

IMG_1137 by E, on Flickr
https://flic.kr/p/QqKAjL
IMG_1136 by E, on Flickr


Interestingly, I took a few photos on the 28th and this mass wasn't showing. I have noticed some lumpyness in the left horizontal arm, so maybe something was growing underneath?
This coral started as a 1" Frag I added to the tank back in January of this year... and despite being an early shipping error where it sat at my front door in -10f weather causing the bag temp to get down to 54, still somehow has survived.



Thanks!

 

[ESH]

I also noticed these things puffed up a bit when the lights went out. Possible boring nudi branch or some kind of worm?

 

[Reefer40b]

Kinda just looks like its putting out its Mesenterial filaments, I don't think you have anything to worry about..

 

[Graffiti Spot]

+1 on Messi filaments

 

[Flippers4pups]

Mesenterial expression is from feeding response or defense. Do you dip your corals before placing in your DT?

 

[ESH]

Thanks.
I've been doing a Dip, Q tank, main display. This one was added in January. Last frag added to the tank was over 2 months ago.