not sure what these are

[saltywaters]

these are in my sump connecting themselves to my bio-balls. What do you all think they are?

 

[motorcyclereefer]

Qtip sponges.

 

[Bifferwine]

Yep, reef safe. No worries.

 

[dcantucson]

Also referred to as Pineapple Sponges. Usually found in abundance in our sumps.