Bicolor Blenny care

Ecsenius bicolor · Saltwater · Beginner level care

A hardy, comical blenny that eats some algae.

Smallest tank30 gallons

Adult size4 inches

Temperature75 to 80°F

pH8.1 to 8.4

GroupFine on its own

TemperamentSemi aggressive

SwimsBottom of the tank

Lives3 to 5 years

Watch for: It claims a hole and can chase similar shaped fish. Keep only one.

Feeding

Twice a day. A small pinch they finish in about 2 minutes. Algae sheets, marine pellets, frozen mysis.

Claims a territory and guards it.

Fish that pass every check with Bicolor Blenny in a 60 gallon tank: same water, overlapping temperature, nobody gets eaten and no bullies.

What size tank does a Bicolor Blenny need?

At least 30 gallons. Adults grow to about 4 inches, so plan for the adult size, not the size at the store.

What temperature does a Bicolor Blenny like?

75 to 80 degrees Fahrenheit, with a pH of about 8.1 to 8.4. A steady temperature matters more than hitting one exact number.

How many Bicolor Blenny should I keep together?

One is fine. If you keep more, keep one male, since males fight each other.

What do Bicolor Blenny eat?

Algae sheets, marine pellets, frozen mysis. Feed twice a day: a small pinch they finish in about 2 minutes.

Checked against these sources on 2026-11-10. When sources disagree we use the safer number.