Species description

Care, breeding and tankmates

Fish profile

Temperament

Semi-aggressive

They are bold, aggressive, and parasitic, utilizing clever mimicry to deceive both predators and prey. Despite their small size, their habit of darting out to bite pieces off other fish makes them a menace to peaceful community tanks. They exhibit no fear of much larger fish, fearlessly attacking anything that swims by.

Diet

Carnivore

In the wild, it is an obligate parasite that sustains itself by biting the skin, mucus, and scales of larger passing fish. In an aquarium, weaning them onto prepared foods can be extremely challenging, though some may accept meaty frozen foods like mysis or brine shrimp. If they do not adapt to captive diets, they will relentlessly harass other fish for sustenance.

Sex ratio

Solitary

It is strongly advised to keep this species completely solitary, as they are highly intolerant of their own kind. Adding multiple individuals to a standard-sized tank will almost certainly result in fierce, often fatal, territorial battles. Only in massive public aquariums might multiple specimens establish distant, separate territories.

Feeding frequency

THREE_FOUR_DAILY

Due to their highly active nature and unusual dietary requirements, they need to be fed small amounts multiple times a day. Attempting to feed them at least three to four times daily with meaty offerings might reduce their instinct to bite tankmates. However, consistent feeding does not guarantee they will stop their natural parasitic behaviors.

Bioload

This is a small marine blenny that produces a very minimal bioload, making it suitable for smaller reef setups. Standard reef tank filtration and protein skimming are more than sufficient to handle its waste production. Regular water changes should still be maintained to keep nutrient levels low for the overall health of the system.

Flow

Strong

They inhabit clear, current-swept coral reefs in the wild and appreciate moderate to strong water movement in the aquarium. Good flow helps them engage in their natural hovering behavior in the water column as they wait for potential 'hosts' to pass by. Sufficient circulation also aids in overall oxygenation and tank health.

Jump risk

Yes

Like most blennies, they possess a torpedo-shaped body and are extremely prone to jumping out of the aquarium. A tight-fitting lid or fine mesh screen is absolutely mandatory to prevent them from becoming carpet surfers. They often jump when startled, chased, or simply exploring the upper reaches of the tank.

Reproduction

Hermaphrodite

Breeding in captivity is practically unheard of due to their specialized diet and aggressive nature towards conspecifics. In the wild, they are pelagic spawners or deposit eggs in empty worm holes or small crevices, where the male guards them. The microscopic fry would require complex planktonic live foods that are difficult to culture at home.

Compatibility & tankmates

Reef safe

Notoriously problematic in community tanks because it is a specialized predator that feeds on the scales and mucus of other fish. It mimics harmless species to get close to its victims before taking a quick bite, causing severe stress to tankmates. It should ideally be kept in a species-only tank or with very large, aggressive fish that can fend off its attacks.

Tank level

All levels

They spend a significant amount of time hovering in the mid-water column, waiting to ambush passing fish. When not actively hunting, they will quickly retreat into small holes or crevices in the live rock near the bottom. Providing plenty of porous rockwork is essential for them to feel secure and establish a home base.