This coral bones can help to achieve the PH and KH value you need. It is rich in Ca.
It is suitable for both fresh water and marine aquarium. It can work as aquarium’s bottom material.
It can work as perfect filter media. This product will come with a mesh bag. You can put the coral bones into your filter canister.
It can help to build an eco-system in your tank. It can help to cultivate eco-bacterial.