Hello bro,
We don't add salt to our tank water neither do we add salt directly into the tank.
Water evaporate but salt don't. It will be good and stay within the tank.
U wanted to start a nano coral tank. Apart from tank, u will need light to support certain type of corals which require proper light to do photosynthesis. A chiller is also a must unless water temperature stays around 28degree.
Water change is recommended to do once a week of 20% but it's better if u have the time, twice a week at 10% would be strongly encouraged
A salinity meter, to measure your tank salinity will also be useful, especially when preparing salt water for water change. It's important to note that corals required a consistent salinity and parameters to survive apart from light and cooler water.
Lastly depending on the type of corals u want to keep these are just some of the very basic equipment and water testing garget required
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