Help me identify this creature

[LordChickenGod]

Sorry for broken English.

One of my plastic tub that I had used to reared Litopenaeus vannamei has some unknowed creature.
Please help me identify it.
https://youtu.be/LLSC06YdTLU

Known living things that are/were in this plastic tub.
- Caulerpa lentillifera
- Chaetomorpha
- Feather Duster
- Small pods
- Brine shrimp
- Litopenaeus vannamei

 

[bertoni]

I have no idea. I can move this post to the Invertebrate forum at some point. You might get more answers there.

 

[mcgyvr]

Looks like very active medusa hydroids/jellyfish to me..
Which are usually armless filter feeders and pretty common..

 

[Bent]

I’m going to go with hydroids to

 

[LordChickenGod]

Thank you guys.

 

[ReefkeeperZ]

definitely hydroids

 

[ReefkeeperZ]

hydroids actually posses a pretty potent sting and can easily irritate sensitive fish and corals.