Fast-acting, easy-to-use liquid lowers pH and makes aquarium water acidic. Colorless formula will not cloud or color aquarium water.The following pH levels are recommended for freshwater tropical fish:Egg-laying fish: 6.6 to 6.8 (slightly acidic)Community aquarium, 7.0 (neutral)Live bearing fish: 7.2 to 7.6 (slightly alkaline)
Contains no phosphate.Danger: Causes severe burns. May be fatal if swallowed. Read cautionary information.Directions For Use:Use API Freshwater pH Test Kit to determine the pH of aquarium water.To lower pH, add two drops of pH Down for each gallon of aquarium water.Take another pH reading before adding the next dose of pH Down.If fish are present in the aquarium, do not change the pH more than 0.2 in any 24 hour period (for example, from 7.2 to 7.0).Danger Poison: contains Sulfuric Acid (EINECNo. 231-639-5). Causes severe burns.Keep out of the reach of children.In case of contact with eyes, rinse immediately with plenty of water and seek medical attention. If on skin, flush with water for 15 minutes. Remove contaminated clothing. In case of accident or if you feel unwell, seek medical advice immediately (show label where possible). If swallowed, do not induce vomiting. Never add water to this product.