The Aiptasia Eating Filefish (Acreichthys tomentosus) is a fascinating and functional addition to many saltwater aquariums. Best known for its ability to help control nuisance Aiptasia anemones, this small, peaceful fish thrives in tanks with at least 30 gallons of space and plenty of live rock for hiding and grazing. As an adaptable and hardy fish, it's a good choice for beginner and experienced aquarists alike.

Though their appetite for Aiptasia is what makes them popular, these omnivores also need a balanced diet of frozen foods like mysis shrimp. They may nibble at some invertebrates or corals, so reef keepers should monitor them closely. With a curious nature, slow swimming behavior, and natural camouflage abilities, the Aiptasia Eating Filefish is as interesting to watch as it is helpful in pest control. Not every individual will immediately take to eating Aiptasia, so a backup removal plan is a good idea.

General Habitat & Tank Requirements:

  • Tank Size: A minimum of 30 gallons.
  • Aquascape: Live rock formations provide excellent cover, security, and natural hunting grounds.
  • Substrate: No specific substrate is required, and they adapt well to sand, crushed coral, or bare-bottom setups.

Water Conditions:

  • Temperature: 75°F to 80°F (23°C to 27°C).
  • pH: 7.7 to 8.5.
  • Specific Gravity (Salinity): 1.020 to 1.026.
  • Water Quality: Maintain ammonia and nitrite levels at 0 ppm, and nitrates below 20 ppm.
  • Filtration: Employ high-quality filtration, such as a protein skimmer, to ensure optimal water quality.

Diet and Feeding

Aiptasia Eating Filefish are omnivores, primarily known for their appetite for Aiptasia anemones. However, they may require supplemental feeding once the Aiptasia population decreases.

  • Frozen Food: Mysis shrimp, brine shrimp, and finely chopped seafood are excellent choices.
  • Pellet Food: Some individuals will accept high-quality marine pellets or flakes, but frozen options are generally preferred.
  • Live Food: Offering live blackworms or enriched brine shrimp can help encourage feeding in newly introduced fish.

Behavior and Compatibility

Aiptasia Eating Filefish are generally peaceful and can coexist with a variety of tank mates. However, they may show occasional curiosity toward certain corals and invertebrates.

Compatible Tank Mates

  • Fish: Clownfish, Gobies, Blennies, Cardinalfish, most Wrasse, Firefish, Tangs, Dwarf Angelfish, and other peaceful fish.
  • Invertebrates: Some individuals may nip at shrimp, feather dusters, and small ornamental crustaceans.
  • Coral: Some filefish may be reef-safe, while others may nip at soft and fleshy corals. Monitor closely in a reef environment.

Behavioral Notes

  • Personality: Curious and intelligent, often engaging in slow, deliberate swimming patterns.
  • Camouflage: Can change coloration to blend with its surroundings, making it an expert at hiding.
  • Aiptasia Control: While effective at consuming Aiptasia, not all individuals will develop a taste for them immediately. Having a backup plan for Aiptasia removal is recommended.