Ruby Reef ARR11136 Rally Aquarium Water Treatment, 16-Ounce Rally is a copper free water treatment for the control and elimination of external parasites in marine and freshwater aquaria It is safe and effective for rapid control of dangerous and destructive infestations such as marine velvet This can be used in combination with Kick-Ich or Sliminator Safe for all fish, corals, invertebrates and macro algae, as well as facultative anaerobes and nitrifying bacteria essential to biologic filtration Available in 16-ounce refill which treats 25 to 50-gallon