Species description

Care, breeding and tankmates

Fish profile

Temperament

Peaceful

Bath's blenny is a peaceful and highly entertaining fish with a big personality. They are incredibly observant and often seem to be watching the aquarist just as much as they are being watched. Once settled, they are quite bold and will spend much of their day perched in plain sight.

Diet

Herbivore

As an obligate herbivore, its diet consists primarily of microalgae scraped from live rock. It must be provided with supplementary marine algae, spirulina, and high-quality herbivore pellets. Failing to provide enough vegetable matter in their diet can lead to malnutrition and fading colors.

Sex ratio

Solitary

Keeping a single specimen is the best practice to avoid aggressive territorial disputes among males. If a true mated pair is acquired, they will often inhabit the same general area peacefully. Multiple males in the same tank will result in severe fighting and stress.

Feeding frequency

Continuous

They are natural continuous grazers, requiring small amounts of food available throughout the day. Direct feeding once or twice a day with specialized herbivore food is highly recommended. Providing an algae clip with nori ensures they always have something to graze upon.

Bioload

Bath's blenny is a very small fish that contributes an insignificantly small bioload to the aquarium. Standard protein skimming and regular water changes will easily maintain pristine conditions. It is an excellent choice for smaller, densely stocked reef systems where nutrient management is critical.

Flow

Strong

Moderate water flow is ideal for this species, providing good oxygenation and promoting algae growth. They often perch on rocks in areas of moderate flow, watching the current for small particles. They will seek out lower flow areas to rest and sleep at night.

Jump risk

Yes

This blenny is known for its startling speed and tendency to jump when frightened. A secure, tight-fitting mesh or glass top is absolutely necessary to prevent escape. Open top tanks are a major hazard for this skittish fish.

Reproduction

Oviparous

Breeding occurs with the female laying eggs in a secure rocky crevice. The male fertilizes the eggs and diligently guards them, fanning them with his pectoral fins to ensure oxygenation. Rearing the microscopic larvae is exceptionally challenging and rarely accomplished by hobbyists.

Compatibility & tankmates

Peaceful

It is a peaceful, completely reef-safe species that will not bother corals or invertebrates. It gets along with a vast array of peaceful community fish such as cardinalfish and gobies. It should not be housed with large aggressive predators or highly territorial blennies.

Tank level

Middle/Bottom

They are exclusively bottom-dwelling fish that rely on the live rock for habitat. They use the rockwork to hop around, as they do not actively swim in the open water column. They require numerous small holes and crevices to use as safe retreats and sleeping quarters.