What is this?!?

[evo.howard2010]

there's some white spongy stuff on the edge of my GSP not sure if its new growth of its dying? Anyone know what it is?

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[spscrackhead]

Prolly a sponge

 

[aaronwitt]

It looks like a sponge from your live rock - not anything bad

 

[evo.howard2010]

So its not part of the GSP

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[m-six hundred]

Nope, its a sponge.