Eheim is the industry leader for aquarium media. EhfiTorf peat pellets will help lower pH and soften your aquarium water. The ideal choice of any planted aquarium hobbyist, this product will help achieve the results many strive to accomplish. This product will release tannins into your aquarium water, giving it a rich golden appearance. It will also promote happier, healthier fish, as it will help in creating a beautiful, natural atmosphere your fish will love. This product is most compatible for aquariums containing fish that thrive in soft water, like angelfish, and neon tetras. This product is for freshwater use only!