Well, instead of bio ball, if you cram rock rubbles in that little compartment, they will do the exact same thing as bio balls. They will trap detritus and make nitrate too.
When people suggest live rocks instead of bio ball, they can do the job better only if you have your rocks in the main tank or someplace where you have good circulation and detritus isn't trapped. The other thing that live rocks can do better is that they house the bacteria that consume nitrate as well but they live in areas of low oxygen, deep in the rocks. Small rock rubble will not have them.
When people suggest live rocks instead of bio ball, they can do the job better only if you have your rocks in the main tank or someplace where you have good circulation and detritus isn't trapped. The other thing that live rocks can do better is that they house the bacteria that consume nitrate as well but they live in areas of low oxygen, deep in the rocks. Small rock rubble will not have them.
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