Be confident in your purchase we're an Authorized Coral RX Dealer. How cool is that?!?!? Coral Rx was developed in 2006 for two purposes: To treat corals suffering from parasites, and as a prophylactic measure to promote healthy corals before parasites or bacterial infections become harmful. Coral Rx is tough on parasites, yet gentle on your coral (contains no iodine or oxidizers) allowing you to be proactive in protecting your investment.