For the majority of cases there is no correct amount of liverock to add to provide sufficient biological filtration. The rules of thumb typically seen thrown around on the mass of liverock per tank volume are of no real use. What it comes down to is the appearence that is being aimed for with the tank overall and therefore the reef structure to be constructed. The liverock has a large surface area available for bacteria to colonise, so even what looks like not much will be able to support enough bacteria. Additionally, if any sand is used within the system (including the sump and/or refugium), then that can contribute a significant amount to the surface area available. Something that is equivalent a quarter of the tank volume or a third of the visual area can provide a great looking tank with plenty of space for fish to swim and growth of corals. But that is personal preference and others may be looking more for a wall of rock look, less with a bommie surrounded by a large area of open sand or something inbetween.

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