Angelfish generally don't need an oxygen pump, but in some special circumstances, they do require additional oxygen.
No Need for Oxygenation Under Normal Circumstances
Angelfish don't have extremely high demands for dissolved oxygen in the water. So, during regular cultivation, generally, there's no need to provide extra oxygen. As long as the water quality is kept good, the oxygen in the water can usually meet the needs of angelfish.
Need for Oxygenation in Special Circumstances
- When Sick: When angelfish are sick, their breathing may be affected. At this time, additional oxygen is needed to help them recover.
- When the Water is Turbid: If the water becomes turbid, the dissolved oxygen content in the water will decrease. In such a situation, if water change cannot be carried out in a timely manner, appropriate oxygenation can be done to ensure the oxygen content in the water.
- In a High - Temperature Environment: Discus fish, a type of angelfish, thrive in high - temperature and high - oxygen conditions and require a relatively large amount of oxygen. In a high - temperature environment, the solubility of oxygen in water decreases. Therefore, extra oxygen may be needed to ensure an adequate supply of oxygen in the water.
- Long - Term Oxygen Deficiency: Prolonged oxygen deficiency can lead to stunted growth in angelfish. So, when raising them, it's important to maintain the oxygen content in the water.
In conclusion, although angelfish generally don't need oxygenation, in special cases such as when they are sick, the water is turbid, the environment is hot, or there is long - term oxygen deficiency, appropriate oxygen supplementation is still required. Therefore, when raising angelfish, it is recommended to prepare an oxygen pump for emergency use.