The regal angelfish or royal angelfish, Pygoplites diacanthus, It is found in tropical Indo-Pacific oceans. Regal angelfish can grow as long as 25 cm. Regal angelfish is one of the most wanted in the aquarium with vivid vertical striations of blue, white, yellow, or orange on the body and pelvic fin. This coloration is more prevalent in specimens that are more mature and are at least 4″ in length.

The Regal Angelfish (Pygoplites diacanthus) is a striking, exotic aquarium inhabitant requiring advanced care. Although typically peaceful, they can be territorial, especially with other angelfish. Slow, careful acclimation is crucial as they are sensitive to environmental changes. Careful observation and continued learning are key to keeping these beautiful fish.

Regal Angelfish

Scientific Name: Pygoplites diacanthus
Family: Pomacanthidae
Minimum Tank Size: at less 100 gallons
Tank Setup: Create a suitable environment with many hiding spots using live rock. They require plenty of cover to feel secure in the tank. The tank should also have open areas for swimming.
Care Level: Difficult
Temperament: Semi-aggressive
Temperature: 72-78° F
pH: 8.1-8.4
Specific Gravity: 1.020-1.025
Max. Size: 10 inches
Diet: Omnivore, fresh shrimp, chopped seafood, Spirulina, and marine algae
Origin: Fiji, Indonesia, Maldives, Red Sea, Vanuatu
Coral Safe: No
Invertebrate: No

Regular water changes and monitoring of ammonia, nitrate, and nitrite levels are important for the health of the fish. Acclimation process should be slow and gradual. Regal Angelfish are known to be sensitive to changes in their environment, so take your time with this step.

Remember, The Regal Angelfish is more difficult to maintain than other species of angels so it should be introduced first so that it may stake out its territory in advance of other fish. Regal Angelfish are not recommended for beginners due to their specific care requirements and sensitivity to water conditions. Always research thoroughly before bringing any new species into your aquarium to ensure you can provide a suitable environment.

A minimum of a 100-gallon tank with plenty of hiding places and live rock for grazing will offer a good environment that Big Tank is more stable water conditions, and more comfort and security in the form of hiding spaces. The Regal Angelfish may nip at large-polyped stony corals, an occasional soft coral, and clam mantles, but may be kept with small-polyped stony corals and somewhat noxious soft corals. Regal angelfish don’t adapt easily to captive life. It’s one fish that almost requires a quarantine period in order to become used to aquarium conditions and be treated medicinally if necessary. After 4 to 6 weeks, the fish is eating well and shows no signs of bacterial infections or parasites, it can be released into the display aquarium.

Please note that the guidelines here are basic care tips and the specifics might vary depending on your aquarium setup and the individual fish’s needs. Always keep an eye on your fish’s behavior, and consult with an aquarium professional if you notice anything unusual.