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To quote Delbeek & Sprung in The Reef Aquarium, pg 343-344
"In a properly established Jaubert system aquarium there is much less rock, leaving wide expanses of the bottom uncovered. The reason for this is twofold. First, since the biological filtration occurs within the gravel bed, the live rock is not needed for biological filtration. One can set up a Jaubert system with no rock at all. Its purpose is just for decoration and the introduction of biodiversity. The second reason for the paucity of rock is that the surface of the gravel bed should be left uncovered as much as possible. This allows unrestricted exchange of oxygen and other dissolved substances, and minimizes advection of detritus into the substrata."
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