What is this large white ball next to my Polyps

[dbradley]

I noticed I have a large white ball next to my polyps. The white ball has a feather like thing coming out of the top of it. Can you tell me what this is? Thank you - David

 

[peterthegamer]

Could be a feather duster. Maybe a sponge but no true answer until you get us pictures.

 

[dbradley]

I forgot to attach the picture. Here it is.

 

[AXxiumRage]

Just a sponge. Harmless.

 

[dbradley]

Thank you for the reply. Do you know how large will it get?

 

[Spongie]

Depends on a lot of variables such nutrients, flow, light intensity (sponges grow best under lower lighting), I've heard even silica content is necessary for prolonged sponge growth. That said if you are worried about it you can just grab it and throw it away. Your call, they can be somewhat useful as filter feeders lowering dissolved organic material from the water column but they can also become nuisances over growing sessile invertebrates (corals).