What are these plant looking things?

[Steve2020]

Have a couple of these in my tank. Looks like some kind of plant. Stems with little hairs on the tips. Strange that it is on one of my Zoa stems. Need a little help with identification and if its good or bad.

 

[nanonøkk]

look kinda like hydroids

 

[Steve2020]

Found some photos on the internet and yes they look like a type of hydroid but can't find if ok to leave alone or how to get rid of if on a coral and not damage the coral.

 

[bday1335]

The second picture with the zoas, is that stringy with a bubble attached to it?

 

[KrisReef]

I have not had these as far as I know.
Others have-Here

 

[Steve2020]

Not Stringy with a bubble. Not Dyno's. Looks like a flowering tip using a magnifying glass.