Brightwell Aquatics DiscusCode trace mineral supplement for Discus. Trace & Minor Elements for Discus & other South American Riverine Fishes Overview * Unique complex that provides trace and minor elements in ratios found to be beneficial to discus and other fishes that share the same waters of origin. * Provides minor and trace elements utilized in important neurological and metabolic reactions, and which are incorporated into natural biopigments for coloration. * Replaces minor and trace elements used by aquarium inhabitants, and which are lost through chemical filtration (use of filtration media such as resins and activated carbon). * Composed of purified water and ultra-high purity materials. * Formulated utilizing extensive research on chemistry of the waters naturally-inhabited by discus, as well as discus trace and minor element requirements.