What is this?

[NewbieC123]

What is this white - spongy looking thing? I noticed it about a month ago. It hasn’t moved. It is in the overflow attached to a pipe.

 

[ISpeakForTheSeas]

That looks like a sponge to me - harmless filter-feeder.

 

[NewbieC123]

That looks like a sponge to me - harmless filter-feeder.

Okay, I thought that might be the case since it hadn’t moved. thank you!