Tumma luonnolisesta materiaalista oleva pohjamateriaali makean veden akvaarioihin. Raekoko 0,5-2mm. Huuhtele hyvin ennen käyttöä. Dark natural substrate for aquariums. Perfect for the plant care in freshwater aquariums. Its porous structure promotes the growth of roots. Suitable for digging fish. Nutrient buffer with high iron content. Is capable of storing excess nutrients, to release them again when needed. The high iron content is absorbed by plant roots Activates the soil flora by motivating the quick and effective colonisation of beneficial ground bacteria. This inhibits the growth of unwanted algae, reducing the work-load on the filter and ensuring crystal-clear water. Accentuates the beauty of the fish: its dark-brown tone highlights their colours and combines with the green and red tones of the aquatic plants to create a harmonious appearance. Ready-to-use substrate which needs to be rinsed once in tap water before use. Calculation formula: The right amount of substrate: length (cm) x width (cm) : 200 = litres substrate with 5 cm thickness