eSHa Optima – Fish Health Booster. eSHA Optima is a unique combination of trace elements, minerals and vitamins that are missing from your tap water. These ingredients help recreate the natural tropical environment your fish deserve. Your fish will flourish and you will see the results. eSHa Optima helps sick or injured fish recover quickly and also toughens your fish against parasites. A water change followed by a dose of Optima will help induce spawning. – Boosts fish health. – Increases resistance against disease and parasites. – Speeds up recovery of sick and injured fish. – Helps induce spawning. 20ml bottle treats 2000 litres (440 gallons).