Originally Posted by Gpsdrew
You need to get live rock to seed the sand to keep the nitrites low.
Not sure where you got this information, but it is wrong.
Beneficial bacteria will coat all surfaces, whether it is the glass of the tank, base rock or sand. Some LR
is needed to seed the tank with coralline algae, or you could get some some scrapings from a local reefer.
There are 3 different strains of bacteria in the Nitrogen cycle. Fish wast and excess food gets broken down creating ammonia in the tank. Bacteria eat the ammonia and produce Nitrites which are consumed by another strain, producing nitrates, which are consumed by another type or removed by partial water changes. That's the simple explanation.