Keep your aquarium plants growing and thriving with the CaribSea Eco-Complete Planted Aquarium Substrate. This ready-to-use formula contains basaltic volcanic soil which contains iron， calcium， magnesium， potassium， sulfur and over 25 other elements to nourish your aquatic plants. It has different-sized granules that help promote optimal oxygen uptake for roots， and a blend of beneficial bacteria that turn fish waste into plant food， and nourish roots to promote healthy growth. Use it to boost plant growth and as a new aquarium cycle starter. Best of all， since it’s packed in a water conditioning solution， it’s easy to use out of the bag， with no rinsing or additional conditioners.