Please help identify

[Sully_z]

Can anyone tell me what these green stocks are ? Not sure if there good or bad. They seem to be spreading and need to know if I should start taking them out.
Thanks

 

[cloak]

Neomeris annulata.

http://www.melevsreef.com/node/450

 

[Sully_z]

Ok thanks but, do I leave it alone to do its thing or get it out. Seems like the bottoms turns white and the top stays green. Not sure if the bottom dying and afraid it will pollute the tank.

 

[cloak]

It's completely up to you.. I think it's actually quite pretty, but being that it is a calcium based algae it will definitely take a toll on your calcium. Much like coralline algae does.

http://www.saltcorner.com/AquariumLibrary/browsespecies.php?CritterID=2046