Fritz Calcium Test Kit

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

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

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 Questions

Is 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.