Yellowtail Black Blenny – Live Aquaria
The Yellowtail Black Blenny, also known as the Flametail Blenny, is striking in appearance with its bold blocks of black and yellow coloration. At first glance, this handsome blenny can be easily misidentified as the popular and similarly colored Bicolor Blenny (Ecsenius bicolor). Upon closer inspection, the observant hobbyist will notice evident differences in appearance and behavior.
The Yellowtail Black Blenny is more elegant in appearance with “softer” features with a rounded head as opposed to the blunted, blockier shaped head of the Bicolor Blenny. Also, the Yellowtail Black Blenny lacks the antennae-like cirri found between the higher set eyes of the Bicolor Blenny. However, the most distinct difference between these two fish is the shape of the caudal (tail) fin.
| Key Features | Description |
|---|---|
| Coloration | Black and yellow blocks |
| Head Shape | Rounded |
| Tail Fin Shape | Distinctly different from Bicolor Blenny |
| Body Structure | Softer, more streamlined |
FAQ
How does the Yellowtail Black Blenny differ from the Bicolor Blenny?
The Yellowtail Black Blenny has a rounded head, lacks the antennae-like cirri found in the Bicolor Blenny, and features a distinct tail fin shape. Its overall appearance is softer and more elegant compared to the blockier, more angular Bicolor Blenny.
What kind of tank conditions does this fish require?
Please contact customer service
Is the Yellowtail Black Blenny suitable for community tanks?
Please contact customer service

Chloe Wilson –
This blenny is a beautiful addition to my tank. The color contrast is vibrant and it looks more natural than the Bicolor Blenny. It’s active but not aggressive, and it blends well with other fish. I noticed the rounded head and different tail shape clearly, which helps distinguish it from similar species.
John Avery –
Arrived healthy and looks exactly as described. The yellow and black pattern is striking. I was worried about confusion with the Bicolor Blenny, but the head shape and tail are clearly different. It’s a great choice for someone looking for a unique, colorful blenny.
Michael Vaughan –
I’ve had this fish for two months now and it’s very active and peaceful. The coloration stands out in the tank, and it doesn’t seem to stress other fish. The details like the rounded head and lack of cirri are noticeable and satisfying to observe.