Aquarium substrate for plants H.E.L.P. ADVANCED SOIL PLANTS H.E.L.P. ADVANCED SOIL PLANTS is a professional substrate for plant aquariums, including the trendy natural aquariums. It is composed of black granules that are 1 to 4mm in diameter. The substrate includes natural organic components only. How does it work? – improved water parameters – the substrate improves water parameters, adopting them to the needs of aquatic plants. It keeps the carbonate hardness level at up to 3°d and the pH level within the range of 5.5-6.5. – nutrients – the substrate contains a large amount of nutrients that are gradually released into the water to ensure the perfect growth of even the most demanding species of aquatic plants that draw mineral substances from the ground. – biological filtration – the porous structure of the substrate provides a perfect habitat for beneficial filtering bacteria that eliminate nitrogen compounds from the water and improve water quality. – decorative qualities – the intensely dark colour of the substrate produces an astounding decorative effect. The lush green or bright red colours of aquatic plants are distinctly visible against the black background of the substrate, creating an exceptional visual impression.