What’s this growing on my trachy

[Nick Steele]

So I’ve had this trachy for at least a year and when young I never seen these but over time they seemed to have bloomed and are now there.

It is slightly green under regular reef lighting and has long stalks it’s coming out of.

 

[Cell]

Colonial hydroids

 

[Nick Steele]

Colonial hydroids

Oh wow thanks!!

Should I be worried if it’s not bothering the trachy? They haven’t shown up anywhere else for over a year so I guess they are contained.

 

[Cell]

I'd eradicate while they are contained then.