ID whats in my overflow box

[Luis_Rosario]

I just noticed this on my overflow box and I was wondering if I should try to clean the overflow box if it could be a pest or they are good and should leave them alone.

Thank you

 

[Gtinnel]

Pineapple sponges

 

[Reefing102]

+1 for pineapple sponges

 

[Luis_Rosario]

Thank you, they’re harmless right?

Pineapple sponges

 

[blaxsun]

Thank you, they’re harmless right?

Yes.