Just want to let you reefers out there know what happen when I used Hikari ICH-X for ich in my reef tank.After first dose it was ok then after 2 doses that I had dead corals in my tank.I got a hold Hikari and told them what had happen to my corals.We exchanged several e-mails back and forth and they finally told me there was nothing they would do for me.I lost about 2500.00 worth of corals.Do not use there products.