What is this?

[Justinlee120]

Sorry for the algae on the refugium, but does anybody know what these are? There's a bunch of them in the sump, but I haven't noticed any in the display tank.

 

[KJ]

Pineapple Sponge.

 

[vetteguy53081]

+1 pineapple sponge- reef safe filter feeding

If you don't want them in display, and old credit card will remove them nicely

 

[Justinlee120]

+1 pineapple sponge- reef safe filter feeding

If you don't want them in display, and old credit card will remove them nicely

Pineapple Sponge.

Thank you both! Glad they're not a big deal.