They are both macro algae. I kept #44 in my previous tank for many years. It was the favoured food of my eunicid worm, actually. From time to time, I did trim this back but it's growth rate isn't so huge that it is a problem. I had some in my new tank, but my Blonde Naso ate it all.
I have also had #45 grow from time to time and have seen photos of one tank that had a ton of this grow in it. This algae builds a Ca tube. I've never been able to keep it alive for any length of time. I really doubt that this will cause you any trouble in the long term.
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400 gal reef. Established April, 2007. 3 Sequence Dart, RM12-4 skimmer, 2 x OM4Ways, Yellow Tang, Maroon Clown (pair), Blonde Naso Tang, Vlamingi Tang, Foxface Rabbit, Unicorn Tang, 2 Pakistani Butterflies and a few coral gobies
My Tank: http://www.canreef.com/vbulletin/showthread.php?t=28436
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