jellyfish looking pod? ID needed please

[AboutToBeReefin]

on the glass they look like a brittle star almost or a little white spider. when they swim they kind of dart and then suspend like a jellyfish. i've never seen any pod like them if they are even a pod? they came on some red gracillaria I got and threw in my sump. now they are all over. they are bigger than my tisbe pods and around the same size as my munnid isopods at the moment. Thanks

video of them in action: here

 

[Bent]

on the glass they look like a brittle star almost or a little white spider. when they swim they kind of dart and then suspend like a jellyfish. i've never seen any pod like them if they are even a pod? they came on some red gracillaria I got and threw in my sump. now they are all over. they are bigger than my tisbe pods and around the same size as my munnid isopods at the moment. Thanks

video of them in action: here

Hydroids.

 

[mcgyvr]

Medusae Hydroids..
Really totally harmless and normal...
Bookmark this for your future use.. Has most of the common stuff..
https://www.lionfishlair.com/hitchhikers-guide/

 

[AboutToBeReefin]

Thanks guys! Bookmarked now