what are you trying to achieve with your fuge? if it's nutrient export then halamdia isn't a great choice as it's a fairly slow grower compared to grape or flat razor caulerpa. there a littlery tons of different types of very pretty macros you can grow in your fuge. rc has a whole forum dedicated to macros, its worth checking out.
http://www.reefcentral.com/forums/fo...c7&forumid=176