Royal Dottyback

Royal Dottyback

The Royal Dottyback (Pictichromis paccagnellorum), also called the royal or bicolor dottyback, is a small reef fish split into two vivid blocks of colour — a deep purple front half meeting a brilliant yellow rear, divided cleanly down the middle. Hardy, inexpensive and dazzlingly coloured, it brings a jewel-like accent to nano and small reef aquariums, and it is an easy fish to keep. Its boldness, however, means its temperament needs to be planned around.

Despite its tiny size, it is a confident, territorial fish that will hold its own against much larger tankmates.

Natural Habitat & Origin

Pictichromis paccagnellorum is found in the western Pacific, where it lives close to the reef, sheltering among rock, rubble and crevices and darting out to feed. It is a secretive species that quickly retreats into cover when disturbed.

In the aquarium it wants exactly that: plenty of live rock with holes and caves to claim as territory and shelter.

Care Requirements

Maintain stable marine conditions: salinity around 1.024–1.026, pH 8.1–8.4, and a temperature of about 24–26°C (75–79°F). Reaching only about 6 cm (2.5 inches), it is well suited to tanks of around 75 litres (20 US gallons) and up, provided there is abundant rockwork. A secure lid is wise, as dottybacks can jump. It is hardy and tolerant of typical reef conditions.

Diet & Feeding

The Royal Dottyback is a carnivore, feeding on small crustaceans and zooplankton in the wild. In the aquarium it eagerly accepts meaty foods: frozen mysis and enriched brine shrimp, finely chopped seafood and quality marine pellets and flakes. Feed once or twice a day; it is an easy, enthusiastic feeder.

Behavior & Temperament

This is a semi-aggressive, territorial fish that punches well above its size. It can harass smaller or more timid tankmates, especially in a small tank, so it is usually best added last so it cannot establish dominance over the whole aquarium. It spends its time patrolling and defending its chosen patch of rock.

Tank Mates

Pair it with robust tankmates that can stand up to its attitude — clownfish, damsels, larger wrasses and similar — rather than very shy or tiny fish. It is reef-safe with corals, though as a small predator it may eat ornamental shrimp, tiny crustaceans and bristleworms, which some keepers consider a useful trait.

Breeding

Pictichromis paccagnellorum is bred commercially, and captive-bred specimens — which tend to be especially hardy and well-adjusted — are often available. Males guard a clutch of eggs in a crevice; rearing the larvae requires dedicated effort but the species is a realistic candidate for marine breeding projects.

Common Health Issues

The Royal Dottyback is hardy and not especially disease-prone, but like all marine fish it can contract marine ich (Cryptocaryon irritans) or marine velvet (Amyloodinium ocellatum) under stress. Quarantine new arrivals, keep water quality stable, and secure the lid against jumping. Mindful of its bold temperament when choosing tankmates, it is otherwise an easy, brilliantly coloured and rewarding fish — and a striking splash of purple and gold for a small reef.