GSP not opening and some weird worm "tunnels" in it's mat

[Jackmot]

Hey!
So, I have a frag of a GSP in a nano tank that was growing and opening beautifully until 3 days ago that started to open less and less each day. Today it didn't opened at all.
My parameters seem good enough and my other corals seem to be doing great and even reproducing (One of my mushrooms just reproduced by pedal laceration).
I've noticed some weird tunnel-like stuff in the mat that I've been trying to blow off but they are difficult to get rid off. A short time ago I saw one of these things in my glass (they appear anywhere, even on rocks) and managed to get a photo. I discovered that there are actually worms living inside these for a short time and then they abandon it.
Could this be the reason the GSP is not opening?
Could anyone help me with an ID of these guys?
PS: It's probably important to mention that I'm battling with ghost flatworms and some dorvilleidae worms

Pulsing Xenia
Mushroom Corals
Green Star Polyps
3 Mexican Turbos
A bit of chateo in the sump

Salinity: 1.024 - 1.025
Kh: 8.0dKh (Salifert test kit)
Ph: 8.0 (API test kit)
Phosphate: approx 0.015ppm (Salifert test kit)
Nitrate: 20ppm (API test kit)
Temp: 24.5 - 25.0ºc

 

[blaxsun]

Occasionally GSP will just close up as an invitation for your cleaning crew to "get to work". I probably wouldn't worry about it too much, as along with cockroaches GSP is probably one of the few things to survive the apocalypse.

 

[Jackmot]

Occasionally GSP will just close up as an invitation for your cleaning crew to "get to work". I probably wouldn't worry about it too much, as along with cockroaches GSP is probably one of the few things to survive the apocalypse.

Got it! Thanks!!
It's not the first time my GSP closes mysteriously but it is the first time this happens in the course of several days so I just wanted to be sure haha

When I read about the cockroaches I just started laughing and nobody around understood why