Bi-colour Blennies

Bi-colour Blennies

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The Bicolor Blenny is also known as the Two-colored Blenny. The Bicolor is so-named because the anterior half is blue to dull brown, and the posterior half is dull orange. Males are generally larger than females and experience a succession of color changes, including blue, when breeding. These Blennies exhibit great personality in the aquarium.


Generally found amid crevices and rocks on the bottom of its environment, the Bicolor Blenny needs a tank of at least 75 litres with scattered rocks for perching and hiding. Opinions are mixed as to whether the Bicolor Blenny is a peaceful tank member and safe for invertebrates.

Some believe the Bicolor Blenny is not safe with other species members and may pick on gobies and firefish. Others say the Bicolor Blenny is a peaceful community fish. Some say the Bicolor Blenny is safe around invertebrates and other sources say it will eat them. The best alternative is probably to combine these groups cautiously.


The diet of the Bicolor Blenny should include vegetable matter, including frozen and dried foods containing marine and blue-green algae. It will also feed on (and help control) algae growing in the aquarium.