The Pictus Blenny (Ecsenius pictus), also known as the White-lined Comb-tooth Blenny, is a small marine fish appreciated for its distinctive appearance and beneficial algae-grazing habits. Native to the central Indo-Pacific region, particularly around Indonesia, the Philippines, and the Solomon Islands, this species is a popular choice among aquarists seeking a peaceful and active addition to their marine aquariums.
• Small fish safe: ✅ Yes
• Small invert safe: ✅ Yes
• Coral safe: ⚠️ Will nip clam mantles
• Minimum tank size: 76 liters (20 gallons)
• Adult size: Up to 5 cm (2 inches)
• Diet: Primarily herbivorous, feeding on algae
• Be aware of: May nip at clams, including Tridacna species; requires ample hiding spots and live rock for grazing; known to jump, so a secure lid is essential.
Appearance and Coloration
The Pictus Blenny features a slender, elongated body adorned with fine white horizontal stripes along its reddish-brown body, which transitions to a yellowish hue towards the tail. The upper and middle stripes are often interrupted by white spots, adding to its unique appearance. Adults typically reach up to 5 cm (2 inches) in length.
Natural Habitat and Behavior
In the wild, Ecsenius pictus inhabits coral reefs, often found at depths ranging from 10 to 40 meters. They are benthic dwellers, frequently seen perching on live corals or within crevices. These blennies are known for their peaceful and inquisitive nature, making them active and engaging inhabitants in an aquarium setting.
Tank Requirements and Water Parameters
To ensure the health and well-being of the Pictus Blenny in captivity:
• Minimum Tank Size: A 20-gallon (76 liters) aquarium is recommended to provide sufficient space for grazing and exploration.
• Water Parameters:
• Temperature: 24°C – 27°C (75°F – 80°F)
• pH: 8.1 – 8.4
• Specific Gravity: 1.020 – 1.025
• Aquascaping: Incorporate ample live rock to create hiding spots and grazing surfaces, mimicking their natural reef environment. Ensure there is open space for swimming and perching.
• Lighting: Moderate lighting supports the growth of algae, which constitutes a significant part of their diet.
• Water Movement: Moderate flow replicates their natural habitat and encourages active behavior.
• Tank Cover: A secure lid is essential, as Pictus Blennies are known to jump, especially when startled.
Diet and Feeding
Pictus Blennies are primarily herbivores with a strong preference for algae:
• Natural Diet: In their natural habitat, they graze on various forms of benthic algae and weeds, aiding in controlling algal growth on reefs.
• Captive Diet: To replicate their natural feeding habits, provide a diet that includes:
• Macroalgae (e.g., seaweed/nori)
• Microalgae-based foods (e.g., spirulina)
• Small crustaceans (e.g., mysis shrimp, brine shrimp)
• Zooplankton
Feeding small amounts 2-3 times daily is recommended to maintain their energy levels and support healthy growth.
Compatibility and Social Structure
The Pictus Blenny is generally peaceful and well-suited for community aquariums:
• Temperament: They exhibit a docile nature but may become territorial towards similar species, especially in smaller tanks. It’s advisable to keep only one Pictus Blenny per aquarium unless a mated pair is introduced in a sufficiently large system.
• Tank Mates: Compatible with a variety of non-aggressive fish and invertebrates. Avoid housing with large, aggressive species that may intimidate or outcompete them for resources.
• Reef Compatibility: While generally considered reef-safe, caution is advised as they may nibble at clams, including Tridacna species.
Important Considerations
• Clam Interaction: Monitor their behavior around clams, especially Tridacna species, to prevent potential nipping.
• Tank Maturity: Introduce them to well-established aquariums with stable water parameters and adequate natural algae growth to support their grazing habits.
• Health Monitoring: Regular observation is necessary to ensure they are receiving adequate nutrition and to detect any signs of stress or disease early.