I think the stuff you are looking at is coraline algae. It is usually purple in colour. Like coral, it will use the Ca and Alk in your tank as it grows. Keeping it healthy will require you to monitor your Ca/Alk levels as mentioned.
Usually, you don't need to introduce this stuff...I'm sure it is there already, unless your LR was REALLY, REALLY dead.
Good water conditions, Ca/Alk control and lighting and you'll have lots of this stuff.
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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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