Diagnose me, Please

[circesmagic]

I have Live Rock and fake rock in my tank, I treat my tank with Purple up everyday as per the Fish Dude, my LR has began growing these things, while I am happy to see things popping up I am concerned....Friend or Foe?

 

[geoj]

The white tube looks like a sponge I have them also they are slow growing in my tank not a prob. I have not found any close look alike to make general identification.