thanks for sharing. I'm also having trouble with red sea mag. test...it comes back low. i use natural sea water in my tank so i use that(just collected) for reference on all my testing...i find API to be accurate enough for my tank..to bad they don't make a mag. test.
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Easy does it...
Current Tank Info: 40b. sps, Metal Halide,big skimmer,lots of flow, barebottom, natural seawater.
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