Bicolor Blenny (Ecsenius bicolor) Care Guide & Buying Guide
The Bicolor Blenny is one of the most personality-packed saltwater fish for reef aquariums. Known for its bold half-blue, half-orange coloration and algae-grazing behavior, this hardy nano-friendly fish is perfect for beginner and advanced reef keepers.
Bicolor Blenny Appearance
The Bicolor Blenny features a striking split coloration — deep royal blue on the front half and vibrant orange-yellow on the rear. Its large expressive eyes and perch-like behavior make it one of the most entertaining reef fish to watch.
Quick Care Requirements
| Scientific Name | Ecsenius bicolor |
| Care Level | Easy |
| Minimum Tank Size | 30 Gallons |
| Reef Safe | Yes (Caution with some LPS corals) |
| Diet | Algae, Spirulina, Herbivore Pellets, Frozen Foods |
| Temperament | Semi-Peaceful |
| Max Size | 4 inches |
How to Care for a Bicolor Blenny
The Bicolor Blenny thrives in established reef aquariums with mature live rock. They spend most of their time perching on rockwork and grazing microalgae. Providing plenty of hiding spots reduces territorial behavior.
Tank Setup
- Live rock with natural algae growth
- Moderate flow
- Stable reef parameters (1.025 salinity, 76–80°F)
- Secure lid (can jump)
Feeding
While they graze naturally, supplement their diet with spirulina flakes, algae sheets, and herbivore pellets. In low-algae tanks, feeding daily is essential.
Why Purchase a Bicolor Blenny?
✔ Natural algae control ✔ Great for nano and reef tanks ✔ Hardy and beginner-friendly ✔ Tons of personality ✔ Affordable reef fish
Buy or Purchase Your Bicolor Blenny TodayIs the Bicolor Blenny Reef Safe?
The Bicolor Blenny is considered reef safe in most aquariums. However, in rare cases, individuals may nip at fleshy LPS corals if underfed. Keeping them well-fed reduces risk.
Tank Mates
Compatible tank mates include clownfish, gobies, firefish, cardinalfish, and peaceful wrasses. Avoid housing multiple blennies in small tanks due to territorial aggression.
Where to Buy a Healthy Bicolor Blenny
Always purchase from a reputable marine aquarium supplier that quarantines livestock, feeds properly, and ships overnight with temperature control. Look for bright coloration and active grazing behavior before purchasing.