Calcium Testing and Addition
Calcium is a major constituent of calcareous algae, skeletal material of hard corals, and the skeletal needles of soft/leather corals. Calcium also fulfills many biological functions.
Quite often a too low calcium concentration retards coral and calcareous algae growth.
NSW contains 400 – 450 mg/L calcium, which is also the value we should strive for. For a stable aquarium environment, the fluctuation in calcium content should preferably not exceed approx. 15 mg/L. This automatically means that the calcium test should be able to monitor comparable fluctuations.
Product Specifications
| Parameter | Value |
|---|---|
| Test Range | 400 – 450 mg/L |
| Fluctuation Detection | Up to ±15 mg/L |
| Application | Marine aquariums, coral and algae growth support |
FAQ
What is the ideal calcium concentration for marine aquariums?
The ideal calcium concentration for marine aquariums is 400 – 450 mg/L.
How does this test help maintain coral health?
This test monitors calcium levels to ensure they remain stable within the optimal range, preventing growth retardation in corals and calcareous algae.
Can this test detect small changes in calcium levels?
Yes, the test is designed to detect fluctuations as small as approximately 15 mg/L, which helps maintain a stable aquarium environment.

Samantha Marshall –
The test is accurate and easy to use. I’ve been using it for several months and it helps me keep calcium levels stable in my reef tank. My corals are growing well and I notice less stress in the system.
Lauren Piper –
It works reliably for checking calcium levels. The instructions are clear and the results are consistent. I appreciate the precision in detecting small changes.
Katherine Rees –
I used to struggle with calcium fluctuations, but this test has made a real difference. I now maintain a steady level between 400 and 450 mg/L, and my soft corals are thriving.