Not a hydroid... But what is it?

[JiminyCat]

At night after lights out I find four or five if these clinging mainly to the glass. When I shine a light on them they move gracefully like an octopus or bring in their tentacles to float away. Anyone know what they are and if they are friend or foe?

 

[ritter6788]

Spaghetti worm?

 

[dmorrison]

I'd guess a free swimming spaghetti worm

 

[JiminyCat]

Looked up spaghetti worm and they look like what comes up for that in Google. I have them in the substrate and rock but didn't recognize them as being the same thing; when they are buried all I see are wandering tentacles.

 

[Downbeach]

Jellyfish, maybe.

Indo Pacific Hitch Hikers

 

[NanaReefer]

Spaghetti Worms for sure


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[Joeysreef]

spaghetti worm