2HR Aquarist APT J/Jazz are specially developed root fertiliser capsules that provide a targeted and long-lasting supply of nutrients for aquarium plants. They are ideal for plants with strong root growth such as Echinodorus, Cryptocorynes and many stem plants. The capsules contain a balanced mixture of macro and micronutrients that are released slowly to promote sustainable plant growth. 2HR Aquarist APT J/Jazz provides the solution to one of the hobby's most tricky challenges-what to do with mature/depleted aquasoil. By imbuing matured substrate with the full potency of fresh aquasoil, enjoy the power to rejuvenate depleted aquasoil instantly and repeatedly.2HR Aquarist APT J/Jazz Plant Growth Booster+ fertilizer capsules for the roots+ long-term nutrient supply directly at the root+ vmakes used soil active again+ promotes strong roots and healthy plant growth+ ideal for heavy feeders and substrate plants+ contains nitrogen, phosphorus, potassium and essential trace elements+ suppor