I test salinity, PH and temp for my water change water. the others are kinda mute point unless you are doing a masive waterchange like ovewr 50%. you can adjust Mg, Alk, and Ca once in the tank.
my reasoning for this is if you do a 10% water change like most do weekly, then if you tank is 400Ca, 11 Alk, and 1400mg
and you add 10% new water that is 300 Ca, 10 Alk and 1200mg
then you are going to end up with a tank level of
aprox 390Ca, 10.9 Alk and 1370-1380Mg
nothing that realy scares me and minor to corect in the tank.
but if your PH and salinity are out while they will only afect the tank a little they are ones that your live stock are more supseptible to changes in.
Steve
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