What is this stuff

[CoralFragAddict]

Anybody know what this is growing, it's been around for 5 months? It's that white stringy stuff?

 

[Sugar Magnolia]

It's a sponge. I have some in my tank.

 

[Bent]

I have that stuff too. Always wondered what it was.

 

[CoralFragAddict]

Strange I would of never guessed that white threads like that being a sponge. Thanks for the info