Carib Sea GeoMarine Crushed Coral
Carib Sea GeoMarine Crushed Coral is a high-performance marine substrate designed for aquarium use. It features a typical particle size between 2.5 mm and 5.5 mm, offering excellent surface area for biological filtration.
With an average density of 72 pounds per cubic foot, it provides structural stability in aquatic environments. This coral type offers over 25 times the buffering capacity compared to other crushed corals, making it ideal for tanks with undergravel filtration or those requiring stable pH levels.
Free from impurities such as ash, metals, pesticides, and silica, it ensures a safe and healthy environment for marine life.
| Specification | Value |
|---|---|
| Particle Size | 2.5 mm to 5.5 mm |
| Density | 72 pounds per cubic foot |
| Buffering Capacity | Over 25 times that of other crushed corals |
| Impurity Content | Free from ash, metals, pesticides, and silica |
FAQ
What is the ideal use for Carib Sea GeoMarine Crushed Coral?
It is ideal for tanks with undergravel filtration or in setups where elevated pH levels are required due to its high buffering capacity.
Is this coral free from harmful impurities?
Yes, it is free from ash, metals, pesticides, and silica, ensuring a safe environment for marine life.
What size particles does the coral have?
The coral has a typical particle size between 2.5 mm and 5.5 mm.

Richard Morrison –
I used this coral in my 55-gallon reef tank with undergravel filtration. The pH stabilized quickly and the water chemistry remained balanced. No signs of metal contamination after three months. Highly recommended for reef keepers needing reliable buffering.
Virginia Hamilton –
The coral broke down slowly and didn’t affect water hardness. My tank’s pH stayed consistent even during water changes. It’s a solid choice for marine aquariums with filtration systems.
Megan Payne –
Works well in my tank, especially for maintaining stable pH. The particle size is consistent and easy to mix into the substrate. Slight improvement in water clarity after a few weeks.