I agree a poll is not a great idea 'cause you can only pick one and I think most of us test for more than one on a weekly or bi-weekly basis. I test for PH daily (monitor), and calcium, alk/dhk, mg and salinity on a weekly basis. I will test for nitrates if I think they may be getting too high and occasionally test for PO4, L2, and Sr.
Of course on a new tank I test ammonia, nitrites and nitrates daily as well as monitoring ph and salinity.
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