Any idea what these are?

[sailor4life]

Hey there I have a 35 dsa lagoon tank and in the recent weeks I’ve had these random things pop up not sure what they are. I asked other forums and no one knew any help would be appreciated thank you !

 

[Reefahholic]

Can’t see the images

 

[ISpeakForTheSeas]

Welcome to Reef2Reef!

Videos can be pretty tricky to upload here - most people upload them to YouTube and link them here from there.

That said, those are colonial hydroids (the first video shows them pretty clearly once it zooms in) - I'm not sure which species (there are quite a few branching species like those), but (with a cursory glance) it reminded me Obelia spp.

 

[jabberwock]

Agree with above. How old is the tank, what kind of rock did you use?