How related are they?
Same family, Acanthuridae (Surgeonfishes and tangs): close cousins
They split at the genus level: the Blue Hippo Tang belongs to Paracanthurus (Palette tangs), the Achilles Tang to Acanthurus (Acanthurus surgeonfishes).
Find the Blue Hippo Tang on the tree · Find the Achilles Tang on the tree
Family lines, side by side
Highlighted rows are groups both animals belong to. The marked row is where their lines go separate ways.
| Rank | Blue Hippo Tang | Achilles Tang |
|---|---|---|
| Kingdom | Animalia Animals | |
| Phylum | Chordata Chordates | |
| Subphylum | Vertebrata Vertebrates | |
| Infraphylum | Gnathostomata jawed vertebrates | |
| Parvphylum | Osteichthyes bony fishes | |
| Gigaclass | Actinopterygii ray-finned fishes | |
| Superclass | Actinopteri | |
| Class | Teleostei Teleost fishes | |
| Order | Acanthuriformes Surgeonfishes, angelfishes and kin | |
| Family | Acanthuridae Surgeonfishes and tangs | |
| Genus split | Paracanthurus Palette tangs | Acanthurus Acanthurus surgeonfishes |
| Species | Paracanthurus hepatus Blue Hippo Tang | Acanthurus achilles Achilles Tang |
Care, side by side
| Fact | Blue Hippo Tang | Achilles Tang |
|---|---|---|
| Type | Fish · Tang | Fish · Tang |
| Care level | Moderate | Expert |
| Reef safe | Yes | Yes |
| Temperament | Semi-aggressive | Semi-aggressive |
| Diet | Omnivore | Herbivore |
| Favorite foods | Frozen mysis shrimp and other plankton-type frozen foods, Dried marine seaweed sheets (nori, red and green algae) on a clip, Spirulina and algae-based pellets and flakes | Dried seaweed (nori) on a clip, Algae-based pellets, Spirulina-enriched brine shrimp or mysis |
| Max size | 12 in (31 cm) | 9.4 in (24 cm) |
| Minimum tank | 180 gal | 180 gal |
| Temperature | 72–78 °F | 72–78 °F |
| Salinity (SG) | 1.020–1.025 | 1.020–1.025 |
| pH | 8.1–8.4 | 8.1–8.4 |
| Nitrate | 0–30 ppm | — |
| Lifespan | More than 30 years in the wild. In aquariums usually 8-20 years, with an average of about 12-14 years according to Animal Diversity Web; disease shortens many captive lives. | Not documented in the sources we checked; no published longevity study or reliable captive lifespan figure was found. |
| Breeding | Very hard | Not achieved |
| Conservation (IUCN) | Least Concern | Least Concern |