JBL Manado 3lIdeal for plant maintenance due to porous structure and nutrient storage function: soil substrate for freshwater aquariums.Vigorous plant growth, algae prevention: effective colonization of soil bacteria and optimal plant root growth due to natural porous structure. Filter relief. Ideal for fish, invertebrates and plants: no release of unwanted substances into the water. Rounded granules spare the sensitive barbels of bottom fish.Storage capacity: natural substrate absorbs excess nutrients and releases them when needed.Included in delivery: soil substrate Manado. Available in various sizes.