hi squee
those of us who use the Tom Barr aka plantbrain Estimative Index method (see the Articles on Dosing thread in the Aquatic FAQ) don't bother with any test kit except for KH and pH (to ensure that you have enough CO2). And it's a nobrainer once you settle on a routine - for myself I do a full fert dosing with every fortnightly water change (30-40%), plus a 50-60% dosage on the alternate week in which I just top up evaporated water.
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