Prodibio Iodi+ is an iodine/iodide compound that contains all the forms of iodine required for coral development and coloration. One ampoule of Iodi+ contains 76 mg of iodine. This allows you to control the quantity of Iodine you are adding in your tank. odine performs a very important role as a trace element in the aquarium environment. Invertebrates need it for coloration and for adapting to lighting variations. Then it helps combat coral bleaching and neutralize the excess oxygen produced by zooxanthellae under excessive lighting. It is eliminated by the algae and invertebrates in the aquarium, by the protein skimmer and the active carbon, and by dispersion into the atmosphere. Dosage for Prodibio Iodi+:One ampoule per 400 litres of water every two weeks.