Frogspawn parasite?

[Guinness]

Hi, I got a bicolor frogspawn a couple days ago. It opened up nice right away. Last night it retracted a few hours before the lights went out. Tonight it did the same and i saw something coming out of one of the heads. It's about 2 inches long. I took the best photo I could. I've attached a photo. Any ideas? Also attached a full tank shot, the 2 hammer corals are still extended.

 

[Tahoe61]

Looks to be expelling waste and or zooxanthellae, not unusual.

 

[GHsaltie]

Or it’s a possibility there is a vermetid snail that has set up camp on the corals head. They release a snot string that can irritate corals. https://www.lionfishlair.com/hitchhikers-guide/vermetid/