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Blennies

Blennies are popular aquarium fish, and for good reason. They are peaceful, colorful, and many are downright helpful. For example, the aptly named Lawnmower Blenny will keep your green algae well trimmed and presentable. With the exception of Fang Blennies, Blennies are totally reef safe- in fact a reef environment is really best for them because they can be shy and the intricate rockwork of a reef provides ample hiding spaces. They are omnivores and should be fed a varied diet of frozen or live foods and plant matter. Blennies do not have teeth or functional jaw, so food must be small enough for them to swallow whole.

Blennies are often confused with Gobies, but there is an easy way to tell the difference. Gobies have two distinct dorsal fins, Blennies have a single dorsal fin that runs the length of their body. Also, Gobies' pelvic fins are fused to form a sucker, similar to Remoras.
| Common name | Image | Taxonomy | Reef safe | Care Level | Description | Max size |
| --- | --- | --- | --- | --- | --- | --- |
| Spinyhead blenny |  | Acanthemblemaria spinosa | Yes | Moderate | Brown checkered body with distinctive yellow frills on head. | 2 cm (0,8 in) |
| Bicolor blenny |  | Ecsenius bicolor | Yes | Easy to moderate | Characterized by the striking contrast of a blue head and upper torso followed by a yellow orange lower torso. | 11 cm (4,3 in) |
| Black combtooth blenny |  | Ecsenius namiyei | Yes | Easy |  | 10 cm (3,9 in) |
| Blackline fang blenny |  | Meiacanthus nigrolineatus | No | Easy to moderate | Yellow bodied with bright blue mask and dark black line running from the eye to the caudal fin. | 9 cm (3,5 in) |
| Black sailfin blenny |  | Atrosalarias fuscus | Yes | Moderate |  | 10 cm (3,9 in) |
| Blue & gold blenny |  | Enchelyurus flavipes | Yes | Easy |  | 5 cm (2,0 in) |
| Bundoon blenny |  | Meiacanthus bundoon | No | Easy to moderate | Black with lighter patch over caudal fin. Very distinctive swallowtail caudal fin. | 8 cm (3,1 in) |
| Canary fang blenny |  | Meiacanthus oualanensis | No | Easy to moderate | Similarly shaped to M. bundoon, but canary yellow. | 5 cm (2,0 in) |
| Diamond blenny |  | Malacoctenus boehlkei | Yes | Moderate | Gray with black splotches, and a yellow mask. Shaped more like hawkfish than a blenny. | 6,5 cm (2,6 in) |
| Ember blenny |  | Cirripectes stigmaticus | No | Moderate |  | 12 cm (4,7 in) |
| Lawnmower blenny |  | Salarias fasciatus | Yes | Moderate to difficult | Tan and brown striped and spotted with iridescence. Requires Mature Tank. | 14 cm (5,5 in) |
| Linear blenny |  | Ecsenius lineatus | No | Easy |  | 9 cm (3,5 in) |
| Midas blenny |  | Ecsenius midas | Yes | Easy to moderate | Although often seen yellow, this fish has the ability to change its color to match the surroundings. It has a very distinctive swallowtail shaped caudal fin. | 13 cm (5,1 in) |
| Molly Miller blenny |  | Scartella cristata | Yes | Easy to moderate | Mottled tan, white, and black covering the body and fins. | 12 cm (4,7 in) |
| One spot blenny |  | Crossosalarias macrospilus | No | Easy |  | 10 cm (3,9 in) |
| Red lip blenny |  | Ophioblennius atlanticus | Yes | Easy to moderate | Black to grayish yellow with red patch over mouth. | 19 cm (7,5 in) |
| Red Sea mimic blenny |  | Ecsenius gravieri |  | Moderate | Sky blue anterior fading to yellow towards the tail, with a black stripe running the eye to the base of the caudal fin. | 8 cm (3,1 in) |
| Sailfin blenny |  | Emblemaria pandionis | Yes | Moderate | Very similar to Salarias fasciatus but slightly darker and with a much larger dorsal fin. | 5 cm (2,0 in) |
| Segmented sailfin blenny |  | Salarias segmentatus | Yes | Easy |  | 10 cm (3,9 in) |
| Starry blenny |  | Salarias ramosus | Yes | Easy |  | 14 cm (5,5 in) |
| Striped blenny |  | Meiacanthus grammistes | Yes | Moderate |  | 12 cm (4,7 in) |
| Tail spot blenny |  | Ecsenius stigmatura | Yes | Moderate | Drab tan all over with dark spot at the base of the caudal fin and a light yellow line through eye. | 6 cm (2,4 in) |
| Two-spot blenny |  | Ecsenius bimaculatus | Yes | Moderate | The top half of this fish is black towards the front and fades to white closer to the tail. The bottom half is white with two distinctive black spots right under the pectoral fins. | 4,5 cm (1,8 in) |
| Convict blenny |  | Pholidichthys leucotaenia | Yes | Moderate | Not actually a blenny but from closely related family Pholidichthys. Juvenile has black eel-shaped body with a distinctive white stripe running down the body. Adults are yellow and black striped. | 34 cm (13,4 in) |