Is it safe to eat coral tank calcium?
Quick Answer
No
Coral tank calcium is not safe for human consumption. It is a type of calcium supplement used in aquariums to support the health and growth of corals. It is not designed or tested for human use and could potentially contain harmful contaminants.

What Is It?
Coral tank calcium is a type of calcium supplement used in aquariums to support the health and growth of corals. It is derived from natural sources, such as crushed coral or limestone, and is often used in reef tanks to maintain optimal water chemistry for coral growth.
Why It Can Be Risky
Consuming coral tank calcium poses several risks:
- Potential contamination with harmful substances, such as heavy metals or bacteria, that could cause illness.
- Possible allergic reactions, especially in individuals with shellfish allergies, as some coral calcium products are derived from shellfish.
- Overconsumption of calcium, which can lead to hypercalcemia, a condition characterized by high levels of calcium in the blood that can cause kidney stones, heart problems, and other health issues.
Safe Alternatives
If you need a calcium supplement, consider products that are specifically designed for human consumption. These are tested for safety and efficacy, and they come with clear instructions on dosage. Always consult with a healthcare provider before starting any new supplement regimen.