Can anyone identify stem-like thing growing on rock?

Hey Guys,



Newbie here.



I have a 29g Biocube running for about 3 months now.



It currently has 2 clownfish, frogspawn coral, few zoa's and polyps.

Also has a CUC.



Few days ago I started noticing this stem-like thing growing from my rock

(can't post pics or links due to this being my first post)



but here are the links to the images:

[http] -colon- -slash- -slash- http://ift.tt/1M85DmT

[http] -colon- -slash- -slash- http://ift.tt/18QYj15





Can anyone help me identify what it is? Is it Algae?



Thanks