The pH management of breeding water is the basics of aquatic biological breeding. 2 drops of reagents to see the pH value immediately. Check the pH regularly with an easy-to-read and easy to use test kit. tap water pH value may vary significantly in region. Measure your tap water first! It is the basic of breeding to stabilize the pH and manage the pH to prevent sudden fluctuations in order to nurture aquatic organisms such as fish, aquatic grass, shrimp, shellfish and microorganisms. The pH value is represented by 0 to 14, which is neutral at pH7, the closer to pH0, the stronger the acid, the more close to pH14, the stronger alkaline. pH is an important environmental factor for aquatic organisms. It is important to maintain proper pH value for each habitat, and to maintain proper pH value for healthy growth. If the pH is beyond the proper range, it is dangerous if it is unable to disintegrate your physical condition, unable to grow, and it will be in a long period of time. Also, if the pH is inclined to alkaline, it will quickly increase the toxicity of ammonia as it suddenly. In addition, the nutrition absorption of the nutrients decreases and cannot grow, especially excess CO2 additives contrary to lower pH and inhibit growth, so you need to adjust the correct amount of CO2 additive. For healthy aquatic organisms we recommend measuring the pH once a week and pH measurement when adding a water change or CO2 where pH fluctuations occur. For more information on the proper pH species, you can read the QR code on the instruction manual and access it. The best hardness for each fish cultivation can be seen by reading the QR code in the instruction manual (English language not guaranteed).