Ocher colored natural gravel (Ø 0 - 2 mm) for all freshwater and marine aquariums Sera Gravel Ocher is a natural, ocher-colored gravel suitable for all freshwater and marine aquariums. It is CO2 proof and chemically neutral, meaning it does not affect water parameters and won’t tint the water. With a grain size of 0–2 mm, this gravel provides an excellent substrate for plant growth. Its rounded grains make it ideal for bottom-dwelling fish such as catfish. Safety & Quality: Sera Gravel Ocher is tested according to DIN 38415-6 / EN ISO 15088 by an independent institute and is proven pollutant-free. It is therefore safe for sensitive and breeding animals. Key Features: Natural ocher color for aesthetic appeal Neutral and CO2 proof, no impact on water parameters Small grain size (0–2 mm) supports plant growth Rounded grains suitable for bottom-dwelling fish Pollutant-free, safe for sensitive species and breeding Use: Perfect for all freshwater and marine aquariums, planted tanks, and aquariums with delicate fish. Ocher colored natural gravel (Ø 0 - 2 mm) for all freshwater and marine aquariums Sera Gravel Ocher is a natural, ocher-colored gravel suitable for all freshwater and marine aquariums. It is CO2 proof and chemically neutral, meaning it does not affect water parameters and won’t tint the water. With a grain size of 0–2 mm, this gravel provides an excellent substrate for plant growth. Its rounded grains make it ideal for bottom-dwelling fish such as catfish. Safety & Quality: Sera Gravel Ocher is tested according to DIN 38415-6 / EN ISO 15088 by an independent institute and is proven pollutant-free. It is therefore safe for sensitive and breeding animals. Key Features: Natural ocher color for aesthetic appeal Neutral and CO2 proof, no impact on water parameters Small grain size (0–2 mm) supports plant growth Rounded grains suitable for bottom-dwelling fish Pollutant-free, safe for sensitive species and breeding Use: Perfect for all freshwater and marine aquariums, planted tanks, and aquariums with delicate fish.