Hydroid or other invert ID

[coralboi56]

What are these in my tank? My best guess is some type of hydroid. If it’s not, please help ID. Thanks!

 

[Aiptaisia anemone]

Fan worms

 

[coralboi56]

Fan worms

Can confirm not fan worms. It broke off and started swimming around like a jellyfish/hydroid

 

[ISpeakForTheSeas]

Can confirm not fan worms. It broke off and started swimming around like a jellyfish/hydroid

Yeah, looks hydroids undergoing strobilation (turning from polyps to ephyra - the free-swimming babies - then medusae - the free-swimming adults).