cobalt blue angelfish

Cobalt Blue Angelfish: A Guide to Care and Maintenance

Cobalt Blue Angelfish, also known as the Blue Angelfish, is a stunning marine fish that is highly sought after by aquarium owners. Their deep blue coloration with yellow accents and distinctive shape make them a beautiful addition to any tank. However, keeping Cobalt Blue Angelfish requires a certain level of care and maintenance to ensure they remain healthy and happy. Here is a guide to help you provide the best possible care for your Cobalt Blue Angelfish.


The Cobalt Blue Angelfish is a medium-sized fish that can grow up to 12 inches in length. They have a tall, oval-shaped body with long, flowing fins. Their deep blue color is accented by yellow or white markings on their face, fins, and tail. They have a small mouth and sharp teeth, which they use to feed on small crustaceans and other invertebrates.

Tank Requirements

Cobalt Blue Angelfish require a well-maintained aquarium with a minimum of 75 gallons of water. They prefer a tank with plenty of hiding places, such as rocks, caves, and live plants. The tank should also have a moderate to strong water flow and a high-quality protein skimmer to maintain good water quality. The ideal temperature for the tank is between 75-81°F, with a pH level of 8.1 to 8.4 and a salinity level of 1.020-1.025.


Cobalt Blue Angelfish are carnivores and require a high-protein diet. They should be fed a varied diet of meaty foods, such as frozen or live brine shrimp, mysis shrimp, krill, and small pieces of fish or shrimp. They may also require supplemental feeding with algae-based foods to meet their nutritional needs.


Cobalt Blue Angelfish are generally peaceful and can be kept with other non-aggressive fish. However, they may become territorial and aggressive towards other angelfish or fish that have a similar body shape. They should not be kept with invertebrates, as they may feed on shrimp, crabs, and other small animals.

Health Issues

Cobalt Blue Angelfish are relatively hardy fish and are not prone to many health problems. However, they may be susceptible to certain diseases, such as ich, marine velvet, and bacterial infections. It is important to monitor your fish for any signs of illness, such as lethargy, loss of appetite, or abnormal behavior. If you suspect your fish is sick, it is best to consult with a veterinarian who specializes in aquarium fish.


Cobalt Blue Angelfish are a stunning addition to any aquarium, but they require a certain level of care and maintenance to thrive. By providing them with a properly sized tank, high-quality water, a varied diet, and appropriate tank mates, you can enjoy their beauty and personality for many years to come.

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