Feather duster ?

[Saaqib_Ansari]

Not sure if I’ve posted this before but there’s these little ‘things’ growing all over the place my tank has been Empty for 1.5 months and I’ve noticed a lot of these ‘feather duster’ things over the tank.
can someone tell me why they are please I feel like there upsetting my zoanthids
P.s; mind the horrible green hair algae
thanks in advance

 

[Pablopufferfish]

Those do look like feather dusters, they shouldn’t bother anything. So I don’t know why they are bothering your zoas. Maybe they are too close for comfort.

 

[35ppt]

Yep, feather dusters. Harmless IME but if you think one is annoying a zoa colony remove the duster if you like.