Use weekly. Does not stain the water in the tank and does not change the value of pH.Creates ideal conditions favorable for breeding fish and luxurious color. Means should be made to the aquarium weekly to replenish mineral components. Dosing: 5 ml of product per 38 liters of aquarium water every week. You can add 3 times a week - in densely populated aquarium, to improve the color of fish that live in water with a low pH (acidic medium).