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I use aqua Fertz root pellets from AquariumPlants.com. $10.99 for a bottle of 75 pellets. They come Total, Phosphate, and Iron. The first two are added every 30 days and the latter every 45 days. You can also order a pellet injector (lengths 18", 24", 36") which might seem silly at first but really comes in handy when you want to place pellets under your plants and not disturb the substrate or get your hands wet.http://www.aquariumplants.com/mobile/Product.aspx?ProductCode=FERT1