Here's why:
* Blood parrots are a hybrid: They are the result of breeding a red devil cichlid with a green severum. This hybridization has led to a variety of physical traits, and sex determination is not consistent.
* No external dimorphism: Unlike some other fish species, there's no clear visual difference between male and female blood parrots. This makes sex determination difficult.
To know the sex of your blood parrot, you'd need:
* Genetic testing: This is the most accurate method but is usually done by experts.
* Spawning behavior: During breeding season, the female may display a darker color and become more territorial, but this is not always reliable.
In short, it's impossible to tell the sex of a blood parrot fish by its appearance.