White algae/mold growing on LR?

[AiredaleReef]

Does anyone know what this is? Found it today all over the Xenia.

 

[Silvergryphon]

Looks like sponge to me.

 

[KAMIKAZE0214]

looks like sponge to me.

+1

 

[AiredaleReef]

Thank you. Was hoping it wasn't bad or some type of fungus.