As I understand it, there are hundreds of sediment dwelling worms that are very grain-size specific with regards to their preferred environment. One example is Rhepoxynius abronius. Although this amphipod is limited to the west coast of North America, I don't see any reason why there wouldn't be similar type organisms living in the more tropical type areas that our corals come from.
If these type of organisms live only in specific size sand sediment, I can't see them existing at all in live rock, no matter the quality.
Even though live rock can appear to make a dsb "live", I think that there is room for improvement with regards to diversity.
Mitch
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