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 64-ounce refill which treats 360-gallon