What happens to dirt under stacked rock aquascaping?

Lizardgi

I used to have lizards
Something I’ve just always wondered! - I’ve seen many reef tanks with the aquascaping consisting of rocks stacked against the back of the tank or stacked up in the corners. When this is done, what goes on beneath the rocks where you can never clean? Is it full of detritus? Even with flow directed into the rocks, you’d think you’d still have layers of buildup. How do you manage this?
 
thats what the cleanup crew is for snails hermits they move the sand around, bristle worms move under the sand and rocks, also some fish gobbies dig under and sometimes if not properly place the rock collapses
 
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