The better kits include a reference sample. If you have that, you should validate the kit by using the reference in place of a sample from your tank. If you don't get whatever the reference value is, something is wrong and you should examine how you're doing the test and/or replace the kit.
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-Mark
29 Gal Bowfront w/24" LED Lights. DIY HOB Sump (5.4 Gal) MP40. Orange Spotted Watchman Goby, 2 Clownfish and a few hermits.
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