I’d please

[Calireefer92]

Hey reefers I got like this sponge type looking things in my sump any idea I’ll try to post the best pic I have

 

[fishguy242]

very cool ,natural filtration

 

[LIreefguy]

Pineapple sponge totally harmless

 

[Calireefer92]

I didn’t know if I should scrap them off the glass my sump is filled with them

 

[Braga]

Just sponges. Harmless and it actually helps with filtration.