Jellyfish like creatures.

[Nano Saltyy]

I got these as hitchhiker with some chaeto that I got from a friend’s s tank. They are pulsing in the bucket with darting like movement. Sizes range fro
about 3-4 mm.
Can anyone ID?
TIA

 

[Isopod80]

Hydroids. Some may have reached the free swimming medusa stage. They typically go away on their own once the tank matures. I wouldn't add them if you can help it.

 

[Nano Saltyy]

Okay

Hydroids. Some may have reached the free swimming medusa stage. They typically go away on their own once the tank matures. I wouldn't add them if you can help it.

I’ll try not to add them. But they seem to be hiding in the chaeto.
Also the chaeto has pods in it and I need Pods badly.
Thanks for your response.