Help Identify please

[d-maz]

Found these in my overflow box today. What are they? Good? Bad? There are probalbly 10 in there. They look like little puff bowls with some strands of something sticking out.

Thanks in advance

 

[sassafrass]

Pineapple sponge, harmless filter feeders

 

[Amoore311]

+1 I have tons of them in my fuge.

 

[d-maz]

Thanks guys

 

[SteveNMegz]

been wondering what those things were growing all over the skimmer haha

 

[Jay1982]

I have um growing on my GSP

 

[WhiteLightsaber]

I've been searching for what those were. They have covered my sump pump.

 

[ethank77]

that is a pineapple spung good for tank they help filter the water