Foreign material such as fish waste, dead vegetation, gravel, aquarium rocks, coral or heavy aeration may cause changes in pH levels. Therefore, the pH level should be tested every week.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)
Directions For UseUse API Freshwater pH Test Kit to determine the pH of aquarium water.To raise the pH, add four drops of pH up for each gallon of aquarium water.Take another pH reading before making the next addition of pH Up.If fish are present in the aquarium, do not change the pH more than 0.2 in any 24-hour period (for example, from 6.8 to 7.0).For freshwater aquarium use only.Danger: Contains sodium hydroxide (EINEC No. 215-185-5). Causes severe burns. Keep out of reach of children. Avoid contact with eyes, skin, and clothing. 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 ill, seek medical advice immediately (show label where possible). May be fatal if swallowed, do not induce vomiting.First Aid Treatment: If swallowed, give large amounts of water or vinegar and call a physician or poison control center immediately.