Anyone know what these white fluffy things on my zoas are? Initially thought just sponge but now that theres more Im unsure? Thanks in advance.

[kozzy]

 

[Crabs McJones]

Tunicates

 

[kozzy]

Tunicates

Good or bad? Should I do anything ?

 

[Maritimer]

Tunicates do no harm that I'm aware of - they're filter-feeders. Sadly, they rarely survive long in our aquariums.

~B.

 

[GSPClown94]

Tunicates do no harm that I'm aware of - they're filter-feeders. Sadly, they rarely survive long in our aquariums.

~B.

These appear to be irritating the zoas enough that the polyps are closing up. Seems harmful to me.

 

[sixty_reefer]

Have you got a pic under white light? At first glance seems a tunicate although it could also be nudibranch, do you see them move? Tunicate usually don’t grow on coral tissue.