Aptasia Eating Filefish

The Aiptasia Eating Filefish (Acreichthys tomentosus) is a unique and highly sought-after marine species known for its effectiveness in controlling Aiptasia anemones. Its camouflage ability, peaceful nature, and utility in reef tanks make it a popular choice among aquarists.

(REEF SAFE WITH CAUTION / INTERMEDIATE)

Essential Information:

• Common Names: Aiptasia Eating Filefish, Matted Leatherjacket, Bristletail Filefish
• Scientific Name: Acreichthys tomentosus
• Family: Monacanthidae
• Origin/Habitat: Native to the Indo-Pacific, found in shallow lagoons and seagrass beds.
• Maximum Size: Up to 4 inches (10 cm)
• Lifespan: Typically 3–5 years with proper care
• Level of Difficulty: Intermediate; requires a well-established tank and may have variable feeding habits.

Appearance & Physical Traits:

• Coloration & Pattern: Mottled greenish-brown coloration that adapts to surroundings for camouflage.
• Body Shape & Structure: Laterally compressed body with a small, pointed snout and a single dorsal spine.

Habitat & Environmental Needs:

• Minimum Tank Size: 30 gallons (113 liters) or larger.
• Water Temperature: Maintain between 74°F and 80°F (23°C to 27°C).
• pH Level: Keep between 8.1 and 8.4.
• Specific Gravity: Optimal range is 1.023 to 1.025.
• Aquascape: Provide live rock with hiding spots and open swimming areas.

Diet & Feeding:

• Diet Type: Omnivorous
• Preferred Foods: Specializes in eating Aiptasia anemones but may also consume frozen foods, mysis shrimp, and pellets.
• Feeding Frequency: Feed 2–3 times daily; may require training to accept prepared foods.

Behavior & Compatibility:

• Temperament: Generally peaceful but may nip at corals and invertebrates.
• Social Behavior: Best kept singly unless in a large system; may show aggression toward similar species.
• Tank Mate Compatibility: Compatible with most peaceful fish; avoid aggressive species.
• Activity Level: Active and inquisitive, often seen picking at rocks and searching for food.

Care Considerations & Additional Notes:

• Ease of Care: Requires patience as it may take time to adjust to prepared foods.
• Special Requirements: Should be monitored in reef tanks, as it may develop a taste for soft corals and polyps.
• Breeding Info: Rarely bred in captivity; little is known about their reproductive behavior.
• Additional Notes: The Aiptasia Eating Filefish is highly effective in controlling pest anemones but should not be relied upon as its sole food source. Some individuals may not eat Aiptasia, so results can vary.