Species description

Care, breeding and tankmates

Fish profile

Temperament

Active

The temperament of the Microspathodon chrysurus can only be described as belligerent, fearless, and aggressively territorial. It will not hesitate to attack fish three times its size, nor will it shy away from biting the hands of the aquarist. Its extreme hardiness is matched only by its fierce attitude, making it suitable only for predator or aggressive community tanks. It is a magnificent fish, but one that demands profound respect.

Diet

Herbivore

As a voracious omnivore, the Microspathodon chrysurus requires a hearty and varied diet to maintain its health and bulk. It eagerly consumes meaty items like krill, chopped squid, and large mysis, along with robust marine pellets. It is crucial to also provide substantial amounts of vegetable matter, such as dried seaweed or spirulina flakes. Its aggressive feeding response ensures it will rarely miss a meal.

Sex ratio

Solitary

It is universally recommended to keep the Microspathodon chrysurus strictly as solitary individuals unless the aquarium is exceptionally large (hundreds of gallons). They are utterly intolerant of conspecifics and will fight to the death if confined together. Even established pairs can suddenly turn on each other in the limited confines of a standard aquarium. Solitary housing is the only reliable way to ensure long-term survival.

Feeding frequency

Twice daily

Feeding the Microspathodon chrysurus two substantial meals a day is ideal to fuel its high energy and large mass. Because it competes so aggressively, it will often dominate feeding times, sometimes preventing others from eating. Spreading food across different areas of the tank simultaneously can help ensure other fish get their share. A well-fed fish may also exhibit slightly less territorial aggression.

Bioload

Medium

The Microspathodon chrysurus produces a moderate to high bioload, especially as it grows to its notably large adult size. It is a ravenous eater that generates a substantial amount of organic waste compared to smaller damselfish. A robust protein skimmer and efficient biological filtration are strongly recommended to handle its output. Regular maintenance is necessary to prevent nutrient accumulation in tanks housing this robust fish.

Flow

Strong

It prefers moderate to strong water flow, which helps oxygenate the water and dissipate its considerable waste. The Microspathodon chrysurus is a strong, powerful swimmer that easily navigates turbulent reef environments. Strong currents also provide environmental enrichment, keeping this active fish physically engaged. It will frequently swim in the open areas of the tank where flow is the strongest.

Jump risk

No

Reproduction

Oviparous

The Microspathodon chrysurus is a demersal spawner that prepares a nesting site on cleared rock or rubble. The male becomes outrageously violent during the spawning period, attacking anything that comes within several feet of the eggs. This includes the aquarist's hands during routine maintenance tasks. While they spawn readily in captivity, the extreme aggression makes them challenging breeding subjects in community setups.

Compatibility & tankmates

Highly aggressive

This is a highly aggressive species that is notoriously difficult to pair with peaceful or timid tank mates. The Microspathodon chrysurus is completely safe with corals and large invertebrates, but it will terrorize small or docile fish. It must be housed with large, equally belligerent species such as triggerfish, large angelfish, or robust tangs. Failure to choose appropriate companions will inevitably lead to the death of weaker fish.

Tank level

Bottom

This highly active fish utilizes all levels of the aquarium, boldly roaming from the substrate to the water surface. The Microspathodon chrysurus acts as a dominant presence, constantly patrolling its perceived territory, which often encompasses the entire tank. It does not hide in the rockwork like smaller damsels, preferring to stay out in the open. Its continuous movement makes it a highly visible, though disruptive, centerpiece.