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Just starting my tank, just waiting for my RO/DI to arrive. I’m looking at buying a testing kit and wanted to know which tests I actually needDo you do weekly water changes? If so it's generally enough to replace minor and trace elements, the big ones you should look out for are Calcium, Alkalinity, Magnesium, Nitrate and Phosphate.
^^^ what they said! They were faster than me with the reply!
You also need something to measure salinity, I prefer this one (it's the only one you'll ever need!)