My API calcium kit tests right in line with my Salifert kit. Also, my API alkalinity test kit always matches my Seachem kit. API makes the best kits I ever used. Maybe they expire before people can use them, or maybe people don't shake the right bottles. I never had a test kit expire but it must be frustrating because they are not properly marked for expiration. Just use them fast, inside of a year should be good for kits without a printed expiration date.
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We were taught to be universally resourceful by the water, the sun, and the stardust.
Current Tank Info: 75 gal AGA sps, 50/25 gal diy acrylic sump, 17 gal diy acrylic fuge
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