Bicolor Blenny

Ecsenius bicolor

(34 Reviews)

Bicolor Blenny
With its striking two-tone body, vibrant orange/yellow front, and black back, the Bicolor Blenny is a captivating addition to any tank. Known for its easy care and playful personality, it's perfect for both novice and experienced hobbyists. Its unique look and curious nature make it a delightful addition to any tank.

Bicolor Blenny

Ecsenius bicolor

(34 Reviews)

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Bicolor Blenny Care Facts

Care Level: Easy
Temperament: Peaceful
Diet: Herbivore
Reef Safe: Yes
Minimum Tank Size: 30 gallons
Max Size: 4 inches
The Bicolor Blenny, Ecsenius bicolor, has a bisecting color pattern with the front half being a blue to pale brown color and the back half is orange/yellow. They are hardy and can be housed with other peaceful fish in a reef tank setting, but may become territorial towards other blennies, gobies or dartfish in smaller tanks.

This blenny will stay mainly towards the bottom of the tank, searching for algae to graze on in between meals. Diet should include a variety of spirulina, marine algae, and seaweed and algae based foods 2-3 times daily.

Bicolor Blenny (Ecsenius bicolor): A Comprehensive Description for Saltwater Marine Aquariums

Habitat of the Bicolor Blenny

Native to the Western Pacific Ocean, the Bicolor Blenny is commonly found in coral reefs, rocky areas, and lagoons, preferring environments with plenty of crevices and hiding spots among live rock.

Is the Bicolor Blenny Reef Safe?

The Bicolor Blenny is generally considered reef safe, as it doesn't threaten corals or other invertebrates within the aquarium. However, it's essential to ensure no aggressive tank mates might harass the blenny.

Size of the Bicolor Blenny

With a size ranging from 3 to 4 inches (7.5 to 10 cm), the Bicolor Blenny is a relatively small species, making it suitable for a range of aquarium sizes.

How Long Does the Bicolor Blenny Live?

Under proper care, Bicolor Blennies can live for approximately 2 to 4 years, providing aquarists with an engaging and relatively long-lasting marine inhabitant.

What To Feed the Bicolor Blenny?

Bicolor Blennies are omnivorous, requiring a diet that includes high-quality marine flakes, pellets, and small meaty foods such as brine shrimp and mysis shrimp. A varied diet helps maintain their health and vitality.

Aquaculture Availability of the Bicolor Blenny

Aquacultured Bicolor Blennies are occasionally available in the hobbyist market, reflecting the advancements in captive breeding and sustainable marine practices. Absent aquacultured specimens, choose wild-caught from a responsible supplier.

Compatibility of the Bicolor Blenny

Bicolor Blennies have a peaceful temperament and can coexist with various tank mates, especially those that are not aggressive or territorial.

Personality of the Bicolor Blenny

Known for their amusing and active behavior, Bicolor Blennies are entertaining to observe as they dart in and out of crevices and explore their environment.

Suitable Tank Mates for the Bicolor Blenny

  • Firefish Goby (Nemateleotris magnifica): A non-aggressive species that adds movement and visual interest to the tank.
  • Yellowtail Damsel (Chrysiptera parasema): A hardy and colorful fish that generally gets along with Bicolor Blennies.
  • Cleaner Shrimp (Lysmata amboinensis): Known for their cleaning behavior, these shrimp can coexist with the blenny.
  • Royal Gramma (Gramma loreto): A peaceful fish occupying a different aquarium level, complementing the blenny's habits.
  • Coral Banded Shrimp (Stenopus hispidus): A compatible shrimp species that adds diversity to the tank.

It's important to note that the compatibility of tankmates can vary based on individual fish personalities, tank size, and the specific setup. Before introducing any new fish to your aquarium, thorough research and careful observation are essential to ensure the well-being of all inhabitants. Additionally, providing plenty of hiding spots, creating a diverse environment, and closely monitoring interactions can help reduce potential conflicts among tankmates.

Tank Requirements for the Bicolor Blenny

Minimum Aquarium Size: A tank with a capacity of 30 gallons or more is suitable for housing a Bicolor Blenny.

Aquascaping: Provide ample live rock with crevices and hiding spots to mimic their natural habitat and offer exploration opportunities.

Ideal Water Conditions for the Bicolor Blenny

  • pH: Maintain the pH level between 8.1 and 8.4.
  • Salinity: Keep the salinity within the range of 1.023 to 1.025.
  • Water Temperature: The recommended temperature range is 72°F to 78°F (22°C to 26°C).
  • Water Flow: A gentle to moderate water flow is preferable, simulating their native environment.

Other Common Names for the Bicolor Blenny

The Bicolor Blenny might also be known as the Two-colored Blenny.

Why Choose Bicolor Blennies from

When selecting Bicolor Blennies from, you choose an engaging and visually appealing addition to your saltwater marine aquarium. Our commitment to sourcing healthy and responsibly collected specimens ensures you receive vibrant and well-adapted fish for your aquatic environment. With our extensive experience and dedication to marine life, is a trustworthy source for enthusiasts seeking quality marine species.

The Bicolor Blenny's distinct attributes and compatibility make it a valuable choice for your saltwater marine aquarium. By adhering to their specific care requirements and creating an environment that caters to their needs, you can enjoy the activity and visual interest this captivating marine inhabitant brings to your tank.

Another survivor from 2 day shipping due to delay and he's doing fantastic.. Cool personality.

Reviewed by: Greg Kelso on June 19, 2024

Reviewed by: Francene Livingston on June 10, 2024

Great personality

Reviewed by: Anthony Little on June 4, 2024

Reviewed by: Gary Sparks on June 3, 2024

Doing wonderfully!!

Reviewed by: Jody Stivers on June 1, 2024

Very active

Reviewed by: Billy Springer on May 22, 2024

Cute little guy

Reviewed by: Maria Robles on April 17, 2024

Love this fish very healthy and playful

Reviewed by: Maria Robles on April 12, 2024

Awesome personality love the Bicolor Blenny.

Reviewed by: Ramon Otero on April 11, 2024

Reviewed by: Justin Leeper on April 9, 2024

Reviewed by: Bryan Kaufman on April 9, 2024

Reviewed by: Cameron Kreger on March 17, 2024

Reviewed by: Joshua Staats on March 3, 2024

Reviewed by: Trevor Cavanaugh on Feb. 15, 2024

Loved to dart in and out of many

Reviewed by: Alvin Barbes on Feb. 14, 2024

Love personality my son’s favorite

Reviewed by: Anthony Little on Feb. 1, 2024

Great color

Reviewed by: Mike Perdue on Jan. 30, 2024

They disappear for awhile

Reviewed by: Alvin Barbes on Jan. 30, 2024

Liked the scooter blenny that I put a bi color blenny in my other tank. It’s great to see him when he comes out but understand, they like to hide. He found a particular hole in one of my rocks and hides there all the time. I know exactly where he is at because I see his head sticking out of the hole.

Reviewed by: Dale Pichelmayer on Jan. 29, 2024

Reviewed by: Lynn Adams on Dec. 13, 2023

Reviewed by: Marcos Quiros on Dec. 10, 2023

Reviewed by: Andrew Zadrejko on Nov. 23, 2023

Good pretty fish

Reviewed by: Charles Felt on Nov. 19, 2023

Reviewed by: Nick Direnzo on Nov. 12, 2023

He’s fun to watch.

Reviewed by: Dinah Martin on Nov. 6, 2023

Reviewed by: Dustin Johnson on Nov. 1, 2023

So far doing well in qt

Reviewed by: Jim Sharpe on Oct. 8, 2023

Just chilling ????

Reviewed by: John Stone on Sept. 17, 2023

Reviewed by: Susan Alexandre on July 24, 2023

Little shy at first but Eating great now.

Reviewed by: Donald Roman on July 13, 2023

The blenny was in great shape when he showed up and Ive had him for 6 months. But I thought I was killing off my 2 Acan colonies but after a few days of observation my blenny was eating them, kinda look like what a lawnmower blenny does to algee. Moved him to my sons FOT. There not always reef safe.

Reviewed by: Darrin on April 23, 2018

Love these little fish. They have so much personality, they are very feisty little fish. Love how they stick up for themselves. Once they have established their territory they defend it to the max. No they are not aggressive, just stick up for themselves

Reviewed by: James Fisher on July 24, 2016

Very healthy fish, eating well.

Reviewed by: Trisha on July 2, 2016

I absolutely love the Bicolor Blenny. They perch in holes in the live rock. If you get them at the right angle their face seems to have spots that light up with the antenaes and mouth. Gives it a very cool look. Mine seems to have found a home under my Zoas and actually protects the Zoas when other fish or crabs get near.

Reviewed by: Jennifer Mckinney on Aug. 4, 2014

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