White Branching

[bouttreepriddy]

I have these white branches growing under some of the live rock in my tank. The area is moderate flow and low light (the anemone usually covers it by mid-day). I assume it's some type of sponge but is this something I should be worried about?

 

[ReefStable Verified Sponsor]

Looks like some kind of sponge to me as well.