The Tailspot Blenny (Ecsenius stigmatura), also known as the Tail-spot Combtooth-Blenny or Stigma Blenny, is a small, vibrant marine fish favored for its algae-eating habits and engaging personality. Native to the Indo-Pacific region, including the Red Sea and western Pacific Ocean, this species is a delightful addition to reef aquariums.
Key Information
• Small fish safe: ✅ Yes
• Small invert safe: ⚠️ With caution
• Coral safe: ✅ Yes
• Minimum tank size: 38 liters (10 gallons)
• Adult size: Up to 7.5 cm (3 inches)
• Diet: Herbivorous, primarily feeding on algae
• Be aware of: May become territorial towards similar species; requires a well-established tank with ample algae growth; known to jump, so a secure lid is essential
Appearance and Coloration
The Tailspot Blenny is easily identifiable by a distinctive black spot at the base of its caudal fin, complemented by thin, dark blue, white to yellow, and orange horizontal stripes running from just below the eye to the rear operculum on each side. Its body exhibits a blue to orange gradient, with hues intensifying towards the tail. Frog-like eyes and small cirri between the eyes add to its charming and comical appearance.
Natural Habitat and Behavior
In the wild, Ecsenius stigmatura inhabits sheltered coral reef habitats down to about 15 meters (49 feet) in depth. They are often found among corals and rocky crevices, where they graze on algae and seek shelter. Known for their inquisitive nature, these blennies often perch on rocks, observing their surroundings. While generally peaceful, they can exhibit territorial behavior towards conspecifics or similar-looking species, especially in confined spaces.
Tank Requirements and Water Parameters
To ensure the well-being of the Tailspot Blenny in captivity:
• Minimum Tank Size: A 10-gallon (38 liters) aquarium is recommended, though larger tanks provide more stability and territory.
• Water Parameters:
• Temperature: 23°C – 27°C (73°F – 81°F)
• pH: 8.1 – 8.4
• Specific Gravity: 1.020 – 1.025
• Aquascaping: Incorporate ample live rock to promote natural algae growth and create hiding spots. A sandy substrate is also appreciated for grazing and perching.
• Lighting: Moderate lighting to support algae growth.
• Water Movement: Moderate flow, mimicking their natural reef habitats.
Maintaining stable water conditions and a mature tank environment is crucial, as fluctuations can negatively impact their health.
Diet and Feeding
Tailspot Blennies are primarily herbivorous and thrive on a diet rich in algae:
• Natural Diet: In the wild, they graze on various types of marine algae.
• Captive Diet: While they will consume naturally occurring algae in the aquarium, supplementation is often necessary:
• Offer marine algae sheets (nori) secured on a veggie clip.
• Provide spirulina-based flake and pellet foods.
• Include occasional fresh or frozen vegetables, such as blanched spinach.
Feeding small portions at least twice daily helps maintain their energy levels and overall health.
Compatibility and Social Structure
The Tailspot Blenny is generally peaceful but exhibits specific social behaviors:
• Territoriality: May become aggressive towards other blennies or similar-looking fish, particularly in smaller tanks. It’s advisable to keep only one per tank unless a mated pair is introduced in a sufficiently large aquarium.
• Tank Mates: Compatible with a variety of peaceful community fish, such as clownfish, gobies, and wrasses. Avoid housing with large, aggressive species that may intimidate or prey upon them.
• Reef Compatibility: Generally considered reef-safe; however, if underfed, some individuals may nip at small-polyped stony (SPS) corals, large-polyped stony (LPS) corals, and clam mantles. Ensuring adequate feeding can mitigate this behavior.
Important Considerations
• Tank Maturity: Best suited for well-established aquariums with natural algae growth to support their grazing habits.
• Jumping Behavior: Known to jump out of open tanks; a secure lid is essential to prevent escape.
• Health Monitoring: Regular observation is necessary to ensure they are receiving adequate nutrition, especially if algae levels decline. A varied diet helps maintain their immune system and overall well-being.