Thought this was a hydroid at first

[i_am_mclovin]

Now I’m thinking it’s not.

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[shwareefer]

You see it catching things and directing to it's 'mouth'. Some kind of worm perhaps?

 

[oceanleaf]

It looks like a sea cucumber to me.
The feeding behavior is very similar to one.
It is a harmless filter feeder but might not survive in a long term.
If the size is small, then there shouldn't be a problem.

 

[i_am_mclovin]

It looks like a sea cucumber to me.
The feeding behavior is very similar to one.
It is a harmless filter feeder but might not survive in a long term.
If the size is small, then there shouldn't be a problem.

Aha we have a winner. That’s what it is. Thank you.