German engineered biological filtration method for Ultra Low Nutrient Systems. Korallen Zucht was founded by Thomas Pohl in the pursuit of simultating the water parameters found in our natural ocean reef environments. Aquarists have long sought an answer to ability to keep dissolved nutrients at untraceable levels while still providing the tremendous amounts of food found on coral reefs. In a traditional closed system, high feeding always meant high dissolved nutrients. Korallen Zucht has found a way through the Zeovit method to allow the home hobbyist to create the natural environment for corals which leads to the corals demostrating their natural exhuberant coloration and healthy growth.