Royal Acara Care Guide – Aquarium Setup, Diet & Breeding

The Royal Acara, Aequidens diadema, is a robust New World cichlid with the deep-bodied shape and confident character typical of its group. Adults commonly show blue-green or turquoise iridescence across the face, flanks and fins, often set against a darker olive, grey or brownish background. Dark markings and attractive fin edging become more pronounced when the fish is settled or displaying.

This species is an intelligent, observant fish that spends much of its time investigating its surroundings. It may sift through the substrate, inspect objects in the aquarium and establish a preferred territory. Although less notorious than some large Central American cichlids, Royal Acaras can still become strongly territorial, especially when paired or breeding.

In nature, Royal Acaras are associated with warm lowland waterways containing submerged wood, leaf litter, roots and patches of aquatic or marginal vegetation. Their colour and behaviour can change with mood, social interactions and breeding condition, making them particularly engaging to watch.

Royal Acaras are best regarded as medium-sized cichlids rather than community fish for small or delicate aquariums. A well-matched adult pair can develop a close bond and display attentive parental behaviour, while incompatible individuals may quarrel over territory.

Royal Acaras are native to northern South America, particularly parts of the Orinoco River basin in Venezuela and Colombia. They inhabit warm, slow-moving to moderately flowing freshwater environments associated with river margins, backwaters and tributary habitats.

A Royal Acara pair should have an aquarium of at least 200 litres, with a footprint of roughly 120 cm by 45 cm; a larger aquarium is preferable for multiple fish or community stocking. Use a fine sand or smooth-gravel substrate that allows natural foraging without damaging the mouth. Arrange sturdy rocks, caves, driftwood and hardy plants to create territories and visual barriers, while leaving open swimming space. Secure decorations firmly because these cichlids may rearrange the substrate and move objects.

Up to about 15 cm (6 in) in total length. Males are usually larger and may develop longer, more extended fins, while females generally remain slightly smaller.

Royal Acaras are omnivores and should receive a varied diet based on a good-quality cichlid pellet or granule. Supplement this with frozen or live foods such as bloodworm, brine shrimp, daphnia and chopped earthworm, along with occasional vegetable matter or spirulina-based foods. Offer modest portions once or twice daily and remove uneaten food to protect water quality.

Royal Acaras can live with sturdy, similarly sized South American cichlids and other robust peaceful-to-moderate community fish, including larger tetras, peaceful barbs, medium-sized plecos and appropriately sized Corydoras in a spacious aquarium. Avoid tiny tetras, shrimp and other fish that may be bullied or eaten, as well as slow, timid species and highly aggressive cichlids. Keeping several territorial cichlids together requires substantial space, visual barriers and careful monitoring; a bonded pair may become particularly defensive when spawning.

Royal Acaras are substrate-spawning cichlids that usually form a bonded pair. Provide a smooth rock, slate tile or other firm surface for the female to clean and lay her eggs, after which both parents typically guard the clutch and defend the fry. The eggs generally hatch within a few days, and the free-swimming young can be raised on newly hatched brine shrimp and other appropriately fine foods. A compatible pair is more reliable than trying to force two unrelated adults together, as courtship can become aggressive.

Males are typically larger, with more extended dorsal and anal fins and a more substantial head and body profile. Females are usually smaller and rounder-bodied, although colour and fin development can vary, so sexing young Royal Acaras by appearance alone is not always reliable.