Worm with tentacles

[Darkcartographer]

I found this on my rocks a few minutes ago. What is it? I don't know if it's related at all, but earlier today I saw what I think are hydroids on the glass of my aquarium.

 

[bstodds15]

Looks like a spaghetti worm to me. They’re not harmful to anything. They live in the sand bed and reach out the tentacles for detritus. Good cuc critter, just a little ugly.

 

[Sean Clark]

My vote is a medusa worm.

 

[Darkcartographer]

Looks like a spaghetti worm to me. They’re not harmful to anything. They live in the sand bed and reach out the tentacles for detritus. Good cuc critter, just a little ugly.

Thank you!

 

[Darkcartographer]

My vote is a medusa worm.

Are those bad or good?

 

[Sean Clark]

Are those bad or good?

Harmless. Good clean up crew.
Spaghetti worms have much finer and longer "tentacles". Do a quick Google image search and you will see the difference.

 

[EeyoreIsMySpiritAnimal]

Looks like a spaghetti worm to me. They’re not harmful to anything. They live in the sand bed and reach out the tentacles for detritus. Good cuc critter, just a little ugly.

Definitely not a spaghetti worm (not a hair worm either )

 

[EeyoreIsMySpiritAnimal]

Harmless. Good clean up crew.
Spaghetti worms have much finer and longer "tentacles". Do a quick Google image search and you will see the difference.

@Sean Clark , I'm so disappointed in you...

 

[Darkcartographer]

Harmless. Good clean up crew.
Spaghetti worms have much finer and longer "tentacles". Do a quick Google image search and you will see the difference.

It does look more like a medusa worm. Thanks for your reply! I just wanted to make sure it's safe to leave in.

Edit:
I do see online that it might release toxins if stressed? Is that correct?

 

[Sean Clark]

@Sean Clark , I'm so disappointed in you...

I thought about tagging you, I really did. I'll do better next time

 

[Sean Clark]

I do see online that it might release toxins if stressed? Is that correct?

Technically correct however I would not worry about it. They are small and the amount they contain is minimal. It is a defensive tool to keep from being eaten. They do not contain the same toxin that regular cucumbers are capable of releasing.

 

[polyppal]

All the marine worms to me are

 

[Sean Clark]

All the marine worms to me are

This is why I stay out of the ocean...

 

[polyppal]

This is why I stay out of the ocean...

same!

 

[Darkcartographer]

Technically correct however I would not worry about it. They are small and the amount they contain is minimal. It is a defensive tool to keep from being eaten. They do not contain the same toxin that regular cucumbers are capable of releasing.

Okay. Thank you for the info!