NeoPlex��_ is a broad spectrum antibiotic effective against most external infections of both marine and freshwater fish. Used as directed, NeoPlex��_ will not discolor the water or damage the filter bed. It is well tolerated by invertebrates, although delicate species may be stressed. Contains neomycin sulfateDIRECTIONS: Use 1 level measure (included) to every 8 L (2 gallons). Repeat once a week for up to three weeks until sym