Cascade Koi & Aquatics have been selling Waterlife treatments for many years. Cuprazin is a Marine treatment for fish only systems. Cuprazin should be used to treat all newly purchased sea fishes except sharks, rays, Harlequin Tuskfish, invertebrates and other related species. In cases where these creatures are present use Myxazin or Octozin as an alternative. Cuprazin should not be used in those systems which contain any invertebrates. This includes crustaceans. Cuprazin should be used for the treatment of Whitespot, Oodinium, Benedenia, Trichodina and fungal infections are amongst the fastest killing organisms and so therefore, once recognised should be treated immediately. With this in mind you are advised, when unsure of an ailments diagnostic background to automatically use Cuprazin as directed. Cuprazins formula is designed to be low stress-inducing, gradually compounding in strength to effective levels. Once this level is achieved addition of the product may be stopped. Cuprazin is a 7 day treatment.