Please note that ich is an invertebrate. You CANNOT kill one invetebrate and not kill the other inverts (snails, crabs, corals, ect.) in your tank. Reef safe meds will not kill the ich in your tank. Reef safe meds help knock the ich off of your fish. The ich will still be alive and well in the sand bed ready to re-attatch to your fish. If you do not kill the ich in your tank then you will be fighting it for the life of your system.