What type of algae is this ?

[ysfawad]

I have it on the top in the tank and looks like its doing better than when it was in the bottom

 

[jsker]

Looks like the beginnings of so bubble algae. Test your nutrients and have your phosphate around .02 to .04 ppm and your nitrates around 4 to 10 ppm. You can carbon dose with NOPox also.

 

[ysfawad]

Its not bubble algae its on big algae like a tree

 

[cloak]

It might be Codium of some type.

http://www.saltcorner.com/AquariumLibrary/browsegroupspecies.php?GroupID=85&filter=0