The recommended stocking density for angelfish is to keep 0.16 - 0.20 fish per liter of water, depending on the volume of the fish tank and the species of the fish. For a fish tank measuring 120×40×60 centimeters, the recommended water volume is about 338 liters. Therefore, the stocking density should be controlled between 50 and 80 fish to keep the angelfish in optimal condition.
The breeding environment for angelfish requires slightly acidic soft water. The suitable water temperature is between 26 - 32°C, the pH value should be between 6.5 - 7.0, and the hardness should be between 3 - 6. During the breeding process, it is necessary to pay attention to the management of water temperature, water quality, and diet. Change the water regularly to maintain clean water quality and an adequate oxygen supply.
In addition, different species of angelfish have different requirements for breeding conditions. For example, saltwater angelfish such as the queen angelfish and the king angelfish need a larger aquarium volume. Their maximum body length can reach 25 - 45 centimeters, and they are suitable for being raised in an aquarium with a volume of over 300 liters. Therefore, choosing the right species of angelfish and an appropriate stocking density is crucial for maintaining the health and vitality of the fish.