The Fritz Calcium Test Kit accurately measures calcium in both freshwater and saltwater aquariums. Calcium is essential for strong coral skeletons in reef tanks, healthy plant growth in freshwater, and firm shells for shrimp and snails, so keeping it in the right range matters across every kind of tank. Support your corals and invertebrates with confidence.Why This Test Kit Accurate in both freshwater and saltwater Essential for coral skeleton growth in reef and marine tanks Important for plant health and for shrimp and snail shells in freshwater Simple titration with an easy pink-to-blue endpoint Helps you dose calcium with confidence Target Calcium Levels Aquarium Calcium Community fish 75+ ppm African cichlids 120+ ppm Marine 300 to 400 ppm Reef 400 to 450 ppm How to Use Fill the test tube to the 5 mL line with your tank water Add 10 drops of Reagent #1 and cap and shake to mix Add Reagent #2 drop by drop, shaking gently, until the color turns from pink to blue Your calcium level in ppm is the number of Reagent #2 drops multiplied by 20 Specifications Brand Fritz Type Liquid calcium test kit (titration) Measures Calcium (Ca2+) Water Freshwater and saltwater Best for Reef, marine, African cichlid, and planted tanks Pair It With Test alongside alkalinity for proper ionic balance Dose calcium with KatsAquatics 3-in-1 Calcium Browse more testing gear and corals Frequently Asked QuestionsIs it for freshwater or saltwater?Both. It is accurate in freshwater and saltwater. Calcium matters for reef corals, planted tanks, African cichlids, and shell-building invertebrates.How does the test work?It is a titration. You add drops of the second reagent until the sample turns from pink to blue, then multiply the drop count by 20 to get your calcium in ppm.What level should I target?Around 400 to 450 ppm for reef tanks, 300 to 400 for marine, 120+ for African cichlids, and 75+ for community fish.
