Unsure what these are!

[AlexandersAquarium]

Hey R2R family,

Have been watching these for awhile, I know terrible photos but they are small I can try to get better photos if these are hard for you. But I'm curious what these are exactly and if their purpose is harmful!

Thoughts?

 

[Crabs McJones]

Branching hydroids

 

[BamboozleBean]

Yep branching Hydroids.

 

[vetteguy53081]

Agree on Hydroids
Joes juice or pickling lime will smothers these pests. You can also remove with a scalpel

 

[Silent]

Better break the tubes or super glue them.