Sponge? Algae? or maybe "coral"?

[Oliver94]

Good evening
How are you guys? I hope you are having a nice week-end!

My 120g reef,5 months old,a couple of weeks ago I found this on my live rock,and was so small to take picture of it,today it has grown 3x its size,and is growing like a tree(i mean many branches) it has a pinkish color..
I took every possible picture that make the "thing" as much visible as possible:



heberger image


herbergeur d image


hebergement d image



Thank you in advanced!

 

[Tahoe61]

I see Neomeris growing on the rock, is it possible the white/pink unidentified is just Codium or Neomeris that was shaded and therefore no longer green?