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I haven’t tried Red Sea but the Salifert does a good job at low levels and I find it very easy to read. Mine tests around 2.5Alk - Hannah checker
Phos - Hannah ULR phosphate checker
Calcium - Hannah for ease of use but Red Sea calcium pro for accuracy
Mag- salifert cheap and accurate
Where I have problem is good nitrate test kit. I have API and Nyos but I don’t think I’m getting good resolution on the near zero levels. Got my eye on Red Sea nitrate pro

