is this a pest? how to get rid of them. I heard is harmless and they get out its own.

[beredovon]

I have hundreds of them in my tank glass. a

 

[jay0705]

Small stars, looks like to me. Np

 

[beredovon]

Small stars, looks like to me. Np

i have a lot. And I searched its a hydroids there harmless is that true?

 

[jay0705]

Yes, there generally a newer tank thing. No worries