Seachem Gray Coast™ Calcite – Natural Marine & Reef Aquarium Substrate

Create a stable and natural foundation for your marine aquarium. Seachem Gray Coast™ Calcite is a premium natural substrate designed to support healthy pH, calcium, and alkalinity levels in marine and reef systems.

Key Benefits:

• Natural calcite substrate for marine aquariums
• Helps stabilize calcium and alkalinity
• Assists in preventing major pH drops
• Suitable for reef, marine, and tropical aquariums
• Lightweight dry substrate with more usable gravel per bag

Stable water chemistry is essential for healthy marine and reef systems. A calcite-based substrate helps buffer water conditions naturally, supporting fish, corals, and invertebrates.

Gray Coast™ Calcite slowly interacts with aquarium water to help support:

• Calcium stability
• Alkalinity balance
• pH buffering

✔ Helps maintain a healthier and more stable aquatic environment

Set Up Tips:

• Rinse before use to remove residual dust
• Add water slowly to minimise disturbance
• Initial cloudiness is normal and temporary

For faster clearing, use:

• Mechanical filtration (filter floss)
• Seachem Clarity™

For faster biological cycling, use:

• Seachem Stability™

If you want a natural substrate that supports stable marine water chemistry while enhancing the appearance of your aquarium, Gray Coast™ Calcite is an excellent choice.