Calcium is one of the most important elements in a reef aquarium.
Reef invertebrates, such as corals, crustaceans, mollusks, and even some type of encrusting algae, need calcium to grow and remain healthy.
Over time, the calcium level drops as it is used by invertebrates, or as it reacts with excess phosphate.
The API Calcium Test Kit measures calcium levels as low as 20 mg/L to help you keep your reef inhabitants healthy.
Test kit includes:
2x calcium test solution
1x glass test tubes
1x easy-to-ready instructions
Fill a test tube to the indicated line with aquarium water.
Holding the calcium test solution vertically above the test tube, add 10 drops of solution 1 and cap the lid. Shake well for 10 seconds.
Shake test solution bottle 2 for 10 seconds and then add bottle 2, drop by drop and watch the colour change from pink to blue.
Inbetween drops, shake the test tube well.
Be sure to count the number of drops added.
As the endpoint reaches, the colour will normally change from pink to purple before it changes to blue.
After the purple colour forms, only 1-2 more drops should be required to reach the blue endpoint.