Calcium, Alk, Mag, these are the 3 big ones that are a must. Nitrate, Phos, and PH are also a good thing to get. Do you use RO/DI water? if not it would be a good idea to start using that. Best thing to maintain these levels are a 2 part Calcium/ALK additive such as E.S.V B-Ionic or C-Balance. The rest IMO is a waste of money.
HTH.
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