Tropic Marin Pro-Coral Potassium is a solution for the Potassium supplement for aquaria. Potassium is an essential main nutrient for all organisms. In seawater the natural potassium concentration is ca. 408 ppm. Potassium consumption in saltwater aquaria usually is small since potassium does not form insoluble compounds and is only minimally adsorbed by other substances. The potassium level can often be maintained by water changes. The use of zeolites and other adsorbers can result in a potassium deficiency. One indication of potassium deficiency is loss of color in corals and the retraction of polyps. With Tropic Marin Pro-Coral Potassium the potassium concentration can be re-adapted to the natural level and may improve vitality and colors of many corals.Tropic Marin Pro-Coral Potassium+ for supply of potassium in aquariums+ essential main nutrient for all organisms+ improve vitality and colors of many coralsUse of Tropic Marin Pro-Coral Potassium:Tropic Marin Potassium contains 10 %