sera Gravel Blue 2 3 mm 3,000 ml Coloured (Diameter mm) for All Freshwater and Saltwater Aquariums

The gravel is CO2 resistant and water-neutral, meaning it does not affect the water values and does not dye the water Thanks to the rounded grit, it is suitable for keeping bottom fish such as catfish that continuously search the soil for food Tested according to DIN 38415-6 / EN ISO 15088 by an independent institute and proven to be free from harmful substances The optimal amount of gravel can be determined as follows: A (cm) x W (cm) x C (cm) / 1000 = litres of sera Gravel