Whitespot, Oodinium, Benedenia, Trichodina and fungal infections are amongst the fastest killing organisms and therefore, once recognised should be treated immediately. With this in mind you are advised, when unsure of an ailment\'s diagnostic background to automatically use CUPRAZIN as directed.CUPRAZIN\'S formula is designed to be low stress-inducing, gradually increasing concentration to effective levels. Once this level is achieved addition of the product may be stopped. 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. Suitable for seawater and brackish water aquaria. Also available in: -60ml (7 day course for 128 litres) -120ml (7 day course for 514 litres) and also 500ml!