are these Possible feather dusters? Growing everywhere in the tank

[HildebrandRarity]

Good morning all please see attached for photo, they look like mini feather dusters and not sure if they are good, bad or neutral

let me know thanks

 

[Crabs McJones]

Pineapple sponges harmless

 

[Paulie069]

Good morning all please see attached for photo, they look like mini feather dusters and not sure if they are good, bad or neutral

let me know thanks

Like the seahorse

 

[HildebrandRarity]

Pineapple sponges harmless

Thanks