What flower on the rock is this ?

[jmichaelh7]

 

[MrDLHughesY]

Feather duster

 

[vetteguy53081]

Pic very blue but appears to be a tube worm which uses the fan to capture food favoring brine shrimp ( very similar habits to hydroids)
Starve it from capturing food and it will be gone
Not a feather duster

 

[jmichaelh7]

Tube worm it is. How do I rid of them ?

 

[MrDLHughesY]

Pic very blue but appears to be a tube worm which uses the fan to capture food favoring brine shrimp ( very similar habits to hydroids)
Starve it from capturing food and it will be gone
Not a feather duster

Feather duster worm ? Looks similar to this

 

[vetteguy53081]

Pic very blue but appears to be a tube worm which uses the fan to capture food favoring brine shrimp ( very similar habits to hydroids)
Starve it from capturing food and it will be gone
Not a feather duster

Hawaii feather dusters are different in size, origin and requirements