ID help please!!!!!

[citytee]

Not sure what it is, just showed up, some type of white/clear stuff hope the picture helps.

 

[saltyphish]

I had something similar that was growing on my live rock where the light did not hit it. Never seemed to hurt anything. I figured maybe a sponge or some type of bacteria. I no longer have it since I treated my tank with chemiclean for a cyano outbreak that was stubborn.