Name: Gulf Signal Blenny - Emblemaria hypacanthus
Brand: TSA Fish
SKU: BLENNYxGulfSignal
Price: 949.99 USD
Availability: InStock

Gulf Signal Blenny - Emblemaria hypacanthus

$949.99

Gulf Signal Blenny - Emblemaria hypacanthus

Beginner Fish Blenny Nano Fish Reef Safe

$949.99

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Diet

algae spirulina mysis shrimp brine shrimp

Min Tank Size 25 gallons

Temperament Peaceful

Reef Safe Yes

Care & Diet Feeding, nutrition, and best practices.

Diet Type: Planktivore

Diet and Feeding: Signal Blennies are primarily omnivorous grazers, feeding in the wild on filamentous algae, microalgae, detritus, and small benthic invertebrates. It is beneficial to make high-quality marine algae the bulk of the captive diet, including nori, red and green seaweed, spirulina-based flakes, and algae-based pellets. To ensure balanced nutrition, supplement regularly with small portions of mysis shrimp, enriched brine shrimp, copepods, and finely chopped frozen marine foods. Offering food on a seaweed clip or in small portions on the rockwork encourages natural foraging and picking behavior. Feed small amounts 2–3 times daily, and maintain careful restraint with portions to prevent overfeeding and preserve water quality.

algae spirulina mysis shrimp brine shrimp

Behavior Temperament, activity level, and interactions.

Temperament: Peaceful

Signal Blennies are small, active perchers that spend most of their time darting between rockwork and stopping to survey their surroundings, so they do best in a well-structured aquarium with ample hiding spots and crevices. They are generally peaceful toward unrelated tank mates but can be territorial toward conspecifics, especially in smaller systems or when shelter sites are limited. A minimum tank size of about 20 gallons is suitable for a single specimen, though larger tanks with abundant live rock, visual barriers, and broken lines of sight reduce stress and aggression. They usually coexist well with other reef-safe species and make good community fish, provided they are not bullied by larger or overly boisterous tank mates. Signal Blennies are primarily carnivorous to omnivorous micro-predators, feeding on small crustaceans, zooplankton, and prepared meaty foods, with occasional grazing on film algae and other benthic growth. Regular small feedings and a mature tank with natural forage help support their feeding behavior and long-term health.

Tank & Aquascape Tank requirements and aquascaping tips.

Min Tank Size: 25 gallons
Max Size: 4 inches
Care Level: Moderate
Origin: Eastern Pacific

Compatibility Tank mates, aggression, and introduction order.

Temperament: Peaceful
Reef Safe: Yes

Reef & Health Reef safety, common issues, and prevention.

Reef Safe: Yes
Care Level: Moderate

FAQs Answers to the most common questions.

How do I tell a true Signal Blenny from similar small cave-dwelling blennies, and what should I expect from its body shape and markings?

A true Signal Blenny is a tiny, tube-dwelling reef blenny with a very slender body, a blunt head, and a habit of perching almost vertically from a hole or crevice. Hobbyists usually notice the “signal” behavior first: it pops up from its shelter and makes quick, deliberate head or body motions. It is not a broad, algae-grazing blenny like a lawnmower blenny. Look for a small, secretive fish with subdued mottling, a cautious personality, and a strong preference for a fixed burrow or rock hole.

What tank setup does a Signal Blenny need to feel secure and thrive?

It needs a mature marine tank with lots of live rock, rubble, and multiple small holes or crevices. The key is providing several “home sites” in the rockwork, because this fish will often claim one spot and defend it. Fine sand is fine, but open hiding spaces are more important than substrate. Strong random flow, stable salinity, and very clean water matter. A tight lid is essential, since these little blennies can dart or jump when startled.

What does a Signal Blenny eat in captivity, and how do I get a picky one feeding?

It does best on small meaty foods: enriched baby brine shrimp, mysis shrimp chopped very small, copepods, amphipods, and finely minced frozen seafood. Many individuals are slow to recognize prepared food at first, especially wild-caught fish. The easiest method is target feeding near its hole with a pipette or feeding stick at the same time each day. Once settled, they usually learn to take frozen foods, but they are not reliable algae eaters and should not be kept on flake or pellet alone.

Can I keep a Signal Blenny with other small reef fish, or will it become aggressive?

It is usually peaceful toward fish too large to swallow, but it can be territorial around its chosen cave, especially with other tiny blennies, gobies, or similarly shaped bottom-dwellers. It does best as a single specimen unless the tank is large and heavily structured. Avoid housing it with aggressive dottybacks, hawkfish, or boisterous feeders that will outcompete it at mealtime. In a reef tank, it generally ignores corals and invertebrates.

Why does my Signal Blenny stay hidden all day and only peek out occasionally—is that normal?

Yes, that is normal. Signal Blennies are naturally cryptic ambush-style reef fish, so they spend much of the day inside a hole with only the head exposed. They often become bolder after a few weeks once they learn the tank is safe and feeding is routine. If it never comes out, check for stressors like bright lighting without cover, insufficient hiding holes, aggressive tankmates, or lack of small live or frozen foods. A healthy specimen will usually “signal” from its perch and quickly retreat when disturbed.

Goes well with:

Gulf Signal Blenny – Emblemaria hypacanthus

The Gulf Signal Blenny is a tiny, charismatic saltwater fish prized for its expressive face, prominent eye cirri, and fascinating tube-dwelling behavior. Males are typically dark brown to nearly black, often displaying contrasting bars and reddish eye cirri with dark tips. Females have a more intricately mottled pattern of brown spots, saddles, and broken markings that provides excellent camouflage against rubble and sand.

Native to shallow coastal habitats in the Gulf of California, Emblemaria hypacanthus occupies abandoned mollusk and worm tubes on sand-and-rubble bottoms. Rather than swimming continuously through the aquarium, this marine aquarium fish spends much of its time watching from a chosen shelter before darting into the water column to capture food. Its compact adult size, unusual behavior, and animated appearance make it an appealing addition to peaceful reef aquariums and carefully planned fish-only aquariums.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 25 gallons
Temperament: Peaceful
Diet: Planktivore
Reef Safe: Yes
Region: Gulf of California, Eastern Pacific
Scientific Name: Emblemaria hypacanthus

Tank Requirements

Provide a mature, stable aquarium with plenty of rubble, small caves, barnacle clusters, and narrow tube-shaped shelters. Empty mollusk shells or securely positioned artificial tubes can help replicate the protected retreats this species uses in the wild.

A mixed sand-and-rubble substrate is ideal, with moderate water movement and enough open space above the rockwork for short feeding excursions. Avoid overly powerful direct flow around its preferred shelter. Because this blenny is small and may be intimidated by active tankmates, place it in a calm aquarium where food can reach its territory.

Use a secure, closely fitted lid and cover small openings around plumbing or equipment. Long-term success depends less on overall swimming space than on stable water quality, suitable shelters, and reliable access to appropriately sized foods.

Diet and Feeding

The Gulf Signal Blenny is a specialized planktivore that naturally feeds on zooplankton passing near its shelter. Offer small, meaty foods such as finely chopped mysis shrimp, enriched brine shrimp, copepods, calanus, cyclops, fish eggs, and finely textured frozen marine blends.

Small sinking or slow-drifting carnivore pellets may be accepted after acclimation, but frozen and live foods are often more effective when establishing newly introduced specimens. Feed small portions two to three times daily, directing food near the fish’s shelter so it does not have to compete with faster tankmates.

A mature aquarium containing a healthy population of copepods and other microcrustaceans can provide valuable supplemental feeding opportunities.

Temperament and Tankmates

This species is generally peaceful toward unrelated fish but may defend the immediate area surrounding its tube or shelter. Males can be territorial toward other Gulf Signal Blennies, particularly when suitable retreats are limited.

Keep a single specimen unless the aquarium is spacious enough to provide numerous separated shelters or the fish are acquired as a compatible pair. Avoid combining multiple males in smaller systems.

Suitable tankmates include peaceful gobies, small cardinalfish, firefish, assessors, and other calm community species. Avoid large predators, aggressive dottybacks, hawkfish, boisterous wrasses, and fast-feeding fish that may intimidate it or consume food before it can feed.

Reef Compatibility

The Gulf Signal Blenny is considered reef safe and is not known to graze on corals, clams, or other sessile reef animals. Its small mouth and planktivorous feeding habits make it appropriate for most established reef aquariums.

It may consume copepods and other tiny crustaceans living within the rockwork, but healthy ornamental shrimp, crabs, snails, and other larger invertebrates are not expected to be targeted. Species-specific aquarium history remains limited, so normal observation is recommended after introduction.

Water Parameters

Temperature: 75–80°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Stable conditions are more important than repeatedly adjusting the aquarium to reach an exact number. Introduce this small blenny only after the aquarium is fully cycled and maintaining consistent salinity and temperature.

Common Considerations

Reaches approximately 2 inches in total adult length.
Requires narrow tubes, shells, or rubble shelters in which it can retreat.
May be shy during acclimation and should not compete with aggressive feeders.
Males can become territorial toward other members of the same species.
Benefits from frequent feedings of small planktonic foods and a mature copepod population.