Osmocote Plus 100 Root Tabs 15-9-12 Size 00 Aquarium Plant Fertilizer An all-in-one solution. One application contains 11 essential nutrients and feeds up to 2 to 3 months in an aquarium. Works with virtually all plant varieties and growing conditions. Each granule is coated with a unique resin that controls nutritional release. Plants get what the need, when they need it. This product is an excellent plant food source for aquarium plants specially heavy root feeders such as Amazon swords. FREE Standard Shipping