Royal Gramma
Gramma loreto
The Royal Gramma, also known as the Fairy Basslet, is one of the most colourful and recognisable small marine fish. Its remarkable two-tone colouration features a brilliant violet-purple head and front body that gradually transitions into vivid golden yellow towards the tail, creating a spectacular contrast against reef rockwork and corals.
Native to the tropical reefs of the Caribbean and western Atlantic, this beautiful basslet naturally inhabits rocky reef slopes, caves and overhangs. It spends much of its time hovering near its chosen shelter, occasionally displaying its unusual habit of swimming upside down beneath rock ledges — perfectly normal behaviour for this species.
Despite its bold colours, the Royal Gramma can initially be shy, often retreating into rockwork when approached. Once settled, however, it usually becomes a confident and engaging aquarium resident, regularly emerging to explore its surroundings and investigate passing food.
Generally peaceful towards other marine fish, the Royal Gramma may become protective of its chosen cave, particularly around members of its own species. It is best kept individually in most home aquariums.
With its brilliant colouration, fascinating behaviour and excellent reef compatibility, the Royal Gramma is a rewarding choice for both new and experienced marine aquarists.
Feeding Notes
Royal Grammas are carnivorous fish that naturally feed on small zooplankton, tiny crustaceans and other marine organisms found around reef structures.
Offer a varied diet of high-quality frozen mysis, enriched brine shrimp, copepods, finely chopped marine seafood and suitable protein-rich marine pellets or flakes.
Feed small portions once or twice daily, ensuring that food reaches the fish's preferred feeding area near its shelter. Newly introduced Royal Grammas may initially remain hidden, so offering food close to their chosen cave can help encourage feeding.
A varied, nutritious diet is important for maintaining their brilliant purple and yellow colouration, overall health and condition.
Aquarium Setup Notes
Provide a mature, stable marine aquarium of at least 120 litres with plenty of established rockwork, caves, crevices and overhangs. The Royal Gramma naturally occupies sheltered reef structures and should have access to a secure retreat where it can establish its territory.
These fish often hover near cave entrances or swim upside down beneath rocky ledges. This unusual swimming position is completely normal and reflects their natural behaviour in the wild.
Moderate water movement is suitable, provided sheltered areas are available away from strong, direct currents. Royal Grammas are adaptable to typical reef aquarium lighting but appreciate shaded areas within the rockwork.
Once established, individuals often become more confident and venture further from their chosen shelter, although they usually remain close enough to retreat quickly if startled.
A secure aquarium lid or mesh cover is recommended. Royal Grammas can jump when frightened, particularly during introduction or when chased by other fish.
Compatibility Notes
Royal Grammas are generally peaceful towards other marine fish and are suitable for a wide range of community reef aquariums. Compatible tankmates include clownfish, gobies, blennies, cardinalfish and other peaceful to moderately active marine species.
Although usually tolerant of unrelated fish, Royal Grammas can become territorial around their chosen cave or section of rockwork. They may display an open-mouthed threat posture or chase away fish that venture too close to their shelter.
Best kept singly in most home aquariums. Multiple Royal Grammas may show significant aggression towards one another, particularly in smaller systems. Compatible pairs or groups are possible in suitably large, carefully structured aquariums, but should not be attempted casually.
Exercise caution with other basslets and similarly shaped territorial species, especially aggressive dottybacks. Avoid large predatory fish or particularly aggressive tankmates that may intimidate the Royal Gramma.
Reef safe: Royal Grammas do not normally nip or damage corals and are compatible with most established ornamental reef invertebrates. As small carnivorous fish, however, they may consume very small crustaceans if encountered.
With suitable tankmates, secure rockwork and adequate hiding places, the Royal Gramma makes an excellent addition to a peaceful mixed reef aquarium.