Sorry about that, it seems like my previous response got cut off. Here's a complete response:

The blue angelfish is a marine fish species that is highly valued in the aquarium trade for its striking appearance and active nature.

In terms of pH and temperature, blue angelfish prefer a slightly alkaline environment with a pH range of 8.0 to 8.4. They also require a temperature range between 72°F and 82°F (22°C to 28°C), which is relatively warm. It is important to maintain these optimal water conditions in their aquarium to ensure their health and wellbeing.

Blue angelfish are known for their vibrant blue coloration, which can vary depending on the age and the individual. They are active swimmers and require a spacious aquarium with plenty of hiding spots and swimming areas. They are also known to be omnivorous, feeding on a variety of foods including algae, small crustaceans, and other small marine organisms. It is important to provide them with a varied diet to ensure their nutritional needs are met.

Additionally, blue angelfish are known to be territorial and may become aggressive towards other fish species. They should be kept with other peaceful species in a large aquarium to minimize aggression.