I check my establish tanks at least weekly when doing water changes. Some I do during the water change mainly PH to assure no major swing in PH has happened. About, an hour after that I come back and check my fert levels, KH iron pat etc. for my planted tanks., than I add what ever is needed, IMO this give me a greater change of getting correct reading as the water has had time to mix with the rest of the tank water.
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