Are these ok?

[ccoakley]

Hello all; I’m not positive I’m posting this in the correct forum. When I first saw these in my overflow, they were tiny and I thought they were some cephalopods; but now as they grown quit large, I am unsure. Does anyone know what they are and are they ok? They are only in my overflow and a small amount in my refugium.

 

[James M]

Pineapple sponges. Harmless filter feeders

 

[ccoakley]

Pineapple sponges. Harmless filter feeders

Thank you.