The 411 on the little blue fish that just kept on swimming.

dori. the little baby blue hippo tang that was known for her “Just Keep Swimming” attitude and her memory problems.

Dory's AKA Blue Hippo Tangs, Regal Tangs and Pacific Blue Hippo Tangs are found within the reefs of the Indo-Pacific to The Great Barrier Reef. Usually found within the depths ranging from 6 - 130 feet. Juveniles and young adult Blue Hippo Tangs are found residing within specific types of Corals and Live Rock. The reason being is when frightened they can easily hide within the branches and caves of the coral and rock.


Available at your local fish store as a juvenile ranging in size from approx. 2” and will grow up to about 12" - 15” in size.

The Blue Hippo Tang consists of a royal blue body, bright yellow tail and unique black outlines. It is important to handle these fish with caution as the sides of the tail (caudal peduncle) and the fin spines are venomous.

tank recommendations

Tank size does vary depending on the size of fish you originally purchase. IF you decide to purchase a Blue Hippo Tang, it could be housed within a smaller system for a short period of time. However, it is imperative to the fishes health and well being to be in the proper sized system.

due to the active nature of this species and the full grown size - 180+ gallon system is recommended.


Housing a full size Blue Hippo Tang in a smaller aquarium is unfair to the species and will cause undue stress to the fish. When housed improperly these fish can become aggressive to it’s tank mates. This fish is also more likely to fall ill due to a poor immune system caused by consistent stress.

The Blue Hippo Tang is very well known to break out from bacterial and parasite infections (internal & external). We strongly recommend that you purchase the fish from a reputable supplier who quarantine the fish and follow all the necessary steps of care before it is released for sale.

Even after initial quarantine, it is imperative to properly quarantine each fish within your own system to ensure the fish is healthy and ready to be released into your display tank.

It is recommended to only house one Blue Hippo Tang at a time within your system. If you are planning on adding more than one, for the ease of introduction it is best to add everyone at the same time.


The Blue Hippo Tang requires a large amount of seaweed to assist in keeping its immune system strong and keep aggression at bay. These curious creatures are open to many types of food including mysis shrimp and roe - both are high in protein and essential fatty acids. It is important to feed a Vitamin C rich diet to help eliminate both head and lateral line erosion, commonly seen within the Blue Hippo Tang species.


Listed as semi-aggressive these fish can definitely cause havoc within a reef system by bullying other tank mates. This is why it is imperative these fish have ample swimming room and a safe place to rest at night.

The Blue Hippo Tang is considered Reef Safe and can be housed with live corals and invertebrates.

in conclusion

Dory is a wonderful little fish, however it is important to understand the requirements of the Blue Hippo Tang. All animals are sensitive to their surroundings and as their owners we are responsible for their well being and safety. Before purchasing, research is key in order to make sure the time, money and patience is readily available to properly take care of Dory.

For more information or any questions you may have