Not sure what the benefits are.
We used to put egg crate at the bottom of the tank to create an airspace and have gravel on top, ie: undergravel filter, or to create an anaerobic space in the case of a plenum. But there are way better methods of filtration and nitrogen reducing methods than these. I am not sure what other uses there are. Maybe supporting your rock.
The question you may want to ask is if you want a bare bottom or coral sand or gravel. I prefer a thin layer of coral sand or gravel.
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