Seachem Onyx Gravel 15.4lb Circulation Pump 000 mg/L of iron and

000 mg/L of iron and is ideal for iron maintenance in the natural planted aquarium

If you are having them shipped you will receive one extra in case of a DOA

Does not contain phosphate or nitrate making it ideal for use with Flourish Nitrogen and Flourish Phosphorus

These biofilms provide your shrimp constantly with a protein-rich food source

Over dosing will not speed impact

Seachem Onyx Gravel 15.4lb Circulation Pump 000 mg/L of iron andFeatures Premium natural substrate for the aquarium Ideal for Tanganyikan Cichlids Rich in carbonates Overview Onyx is a specially fracted natural substrate for the aquarium. Onyx is suitable for any marine or freshwater environments and is ideally suited for Cichlid environments. Onyx is most effective when used alone as an integral substrate bed, but it may be mixed with other gravels or sands such as Onyx Sand. Onyx is not chemically coated or