New tanks I'll test most all "important" params a few times a day. Once dosing is dialed in and things mature a bit I sometimes test ALK and more rarely po4.
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The only way you can test too much is if you are removing so much water your auto top off can't keep up and salinity drops. IE next to impossible. It's what you do with that test information. If I test my water yesterday and it tests at 7.5 dkh and I test today and it's 15 but there is no noticeable difference in my alkalinity solution I know the test is wrong either due to test kit failure or user error. Any test that is outside of the range of possibility should be retested before any attempt at changing the parameters is done.
forgot to add that I do have apex, so of course I have temp, ORP and Ph probes so something I don't need to test for but know what it is and set alarms incase it is out of whack. I also think that Salifert IMO is best for Mag, Cal and Alk. Very easy to use and seems accurate. I am thinking of selling all my Hanna kits - they are unreliable and just cannot trust anymore.I completely agree! I test Alk, Cal, Mag daily. Phosphates and Nitrate weekly.