Please help identify these things under the birdsnest

[Badboy GP]

hi all,

Please help me identify these thingys under my birdsnest colony.

I'm worried its something that will kill the colony

 

[fishguy242]

hi,do they all have brown tubes?

 

[SeaDweller]

Maybe hydroids

 

[Badboy GP]

I

hi,do they all have brown tubes?

Need to chexk this out.

 

[Badboy GP]

Maybe hydroids

It does look like this, now I need to see how to remove