09-01-2006, 05:38 AM
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Hey Blue, Zeb...Glad to see you 2 here :D
Regarding LR or Live Rock. As Zeb stated, it's full of little critters, micro-organisms, sometimes shrimp, etc., which helps with biological filtration.
LR is used in sumps, becuase it's a more natural form of filtration. You may wish to add it into your tanks as well for more biological filtration, but it's not necessary. Just the more LR, the better biological filtration. When people add LR to their tanks, it tends to be more a reef setup.