Sand can actually help a lot.
Aragonite breaks down, introducing trace elements and calcium naturally to your system.
It also can host a number of living organisms that are beneficial to your system as a potential food source for inhabitants or as detritus/waste eaters.
If you have enough sand, it can act as a significant addition to your biofilter as well and help give beneficial bacteria surface area to populate.
I will always put sand into any reef tank I have, not just based on how much better it looks either.
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