Iodine Booster provides an instantly available source of Iodine which is specially formulated for seawater aquaria. Iodine is known to help corals recover from bleaching, light shock, improves colour pigmentation, growth and prevents goitres in fish. Iodine Booster replaces lost levels of this important element caused by protein skimming, carbon absorption, biological activity and algal uptake. Natural levels 60ppb approximately Iodine Booster does not harm filtration bacteria Free from phosphate & nitrate