The main treatment methods for blood parrot cichlids whose body color turns black include the following situations:
Being Scared: Blood parrot cichlids are relatively timid and are easily scared, which can cause their bodies to turn black. The solution is to keep the surrounding environment quiet, avoid loud noises or other sources of interference. Usually, the color of the blood parrot cichlids will return to normal within a few days.

Sudden Environmental Change: Excessive changes in water quality or a large temperature difference in water temperature can also cause the bodies of blood parrot cichlids to turn black. The solution is to maintain the stability of water quality and water temperature. The water temperature should be controlled between 25°C and 28°C, and avoid frequently changing the water or equipment in the fish tank.
Illness: Blood parrot cichlids may suffer from black spot disease, resulting in black spots on their bodies. The treatment method is to soak the blood parrot cichlids in a 2% to 3% saltwater solution for 5 to 10 minutes once a day. The effect can be seen after 4 to 5 days of continuous treatment.
Genetic Problem: The genetic mutation of blood parrot cichlids may also cause their bodies to turn black. In this case, treatment is usually not required, and the black spots may disappear when the fish reaches adulthood.
Preventive Measures:
Keep the Water Quality Clean: Regularly clean the remaining bait and fish feces in the fish tank to avoid water pollution.
Control the Amount of Water Change: The amount of water changed each time should not exceed one-third or one-fourth of the total water volume, and avoid frequent and large-scale water changes.
Stabilize the Water Temperature: Keep the water temperature between 25°C and 28°C to avoid large fluctuations in water temperature.
Provide a Quiet Environment: Avoid placing equipment that makes loud noises around the fish tank and keep the environment quiet.