Why is a saltwater angelfish hard to keep?

Saltwater angelfish are challenging to keep due to their specific dietary and environmental needs. They require a well-maintained aquarium with stable water parameters, including temperature, salinity, and pH levels. Additionally, these fish can be territorial and aggressive, especially in smaller tanks, making it essential to provide ample space and hiding spots. Their sensitivity to changes in water quality and stressors further complicates their care, demanding experienced aquarists for successful management.