The Bicolor Blenny is a hardy, comical fish, dusky blue at the front and orange at the back, with expressive eyes and a habit of perching and peeking from rocks.
Its personality and toughness make it a popular beginner marine.
It is reef-safe and helps graze film algae, though it needs supplemental feeding once natural algae thins.
Easy to keep and full of character, it suits new and experienced reef keepers alike.
Housing
House in a reef tank of at least 110L (30 gallons) with plenty of live rock providing algae, perches, and a hole or crevice it can claim as a home base.
A mature tank with algae film suits it well.
Maintain temperature 24-27C (75-81F), salinity 1.024-1.026, pH 8.1-8.4, and ammonia and nitrite at zero.
A secure rock retreat gives this perching fish confidence and frequent visibility.
Diet
An algae-leaning omnivore that grazes film algae and diatoms but also takes meaty foods.
Offer dried nori, spirulina flakes, algae pellets, and frozen mysis and brine shrimp one to two times daily.
A varied diet weighted toward vegetable matter keeps it healthy and reduces any temptation to nip corals.
Supplement well once natural tank algae is grazed down to prevent a hollow belly.
Health
Hardy and disease-resistant relative to many marine fish, though quarantine and stable water are still sensible.
Most losses come from starvation in algae-poor tanks or from jumping rather than from illness.
Watch the belly profile and appetite; a pinched stomach signals the need for more food.
Provide a secure lid, as bicolor blennies are capable jumpers given any open gap.
Temperament
Generally peaceful but territorial toward other blennies and sometimes similar small fish, occasionally nipping at tankmates that invade its space.
Keep one per tank unless you have a bonded pair.
It is reef-safe with corals and invertebrates, though the rare individual may nip coral polyps if underfed.
Mostly it is an entertaining, characterful fish that perches openly and interacts with its keeper.
Beginner
Beginner
Beginner
Beginner
Beginner
Beginner