Korallen-Zucht™ produces a wide range of additive products formulated for both general application and targeted color refining. Each of these additives has been tested and formulated by the most qualified labs and uses only the highest grade ingredients. Corals and other reef animals use up macro and trace elements to fuel their growth, respiration and other metabolic processes. Korallen-Zucht has a wide range of supplements to aid with the replenishment of these elements.