Instant Ocean Salt is the preferred choice of aquarium hobbyists and professionals. It is the most synthetic sea salt on the market and has been carefully formulated. This product contains every element needed for the health of marine animals. It maintains the perfect pH of your aquarium and in minutes, provides clear water. No special additives are required for mixing, it is a one-part formulation product. Marineland Labs has scientifically tested and performance-certified Instant Ocean Salt. For the longevity of most brackish water fish you can add 1 to 2 tablespoons of marine salt per gallon of water. Puffers require saltier water in which you will need to add 3 to 5 tablespoons of marine salt per gallon of water.