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Currently have the api master test kit. Unfortunately it doesn't test hardness kh or gh. Trying to breed crystal shrimp where that stuff is important. What is kit that members here prefer to use to test that stuff?
which will test for TDS. I was never sure what to do with a TDS result so I just went for the KH/GH kit, but then I wasn't breeding shrimp either... I am not sure. I guess it just depends on what you are wanting to do/needing to know.