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One of the active ingredients in Fritz FixIck is Gentian Violet
One teaspoon (5 mL) will raise 10 US gallons by 1
NOTE: If magnesium levels are too low
For that purpose a proper calcium additive together with an accurate test kit are required
Best of all
HI758 Hanna Instruments HI758 CALCIUM COLORIMETER HANNA CHECKER - MARINE WATER media/reactors One of the active ingredientsAlways get accurate results for your saltwater aquarium with our handheld colorimeter. Our saltwater calcium colorimeter fills the gap between calcium test kits and advanced instrumentation. Standard test kits have limited accuracy as they depend on the human eye to determine colors. Our handheld colorimeter eliminates the trouble of matching to a color chart by providing a direct saltwater calcium result in ppm Ca2+. Our portable handheld colorimeter
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