Matted (Aiptasia Eating) Filefish - Acreichthys tomentosus

The Matted Filefish (Acreichthys tomentosus), also known as the Aiptasia-eating Filefish, is a unique and highly sought-after fish for reef aquariums due to its ability to consume the troublesome Aiptasia anemones. This fish is a natural solution for controlling Aiptasia outbreaks, which are commonly encountered in marine tanks. With its fascinating appearance and useful dietary habits, the Matted Filefish is a valuable addition to a reef system.

Description:

• Common Name: Matted Filefish, Aiptasia-eating Filefish

• Scientific Name: Acreichthys tomentosus

• Family: Monacanthidae

• Size: Up to 4.7 inches (12 cm)

• Coloration: The Matted Filefish is recognized for its unique body shape and coloration. It features a brown or greenish-brown body adorned with white or yellowish spots. The fish’s texture is somewhat rough, giving it a “matted” appearance, which helps it blend into its surroundings. It has a characteristic flattened body with a prominent, spiny dorsal fin.

• Lifespan: Typically 5-7 years in captivity with proper care.

Native Region:

The Matted Filefish is native to the Indo-Pacific region, including the Philippines, Indonesia, and northern Australia. It is commonly found in shallow coral reefs, where it feeds on algae and small invertebrates.

Aquarium Setup:

• Tank Size: A minimum of 30 gallons (114 liters) is recommended for a single Matted Filefish. A larger tank is better for providing ample space for the fish to forage and swim.

• Substrate: Fine sand or a mix of sand and rock is ideal, as this species may graze on algae and small invertebrates found on the substrate.

• Live Rock: Live rock is essential for providing natural grazing areas, as the Matted Filefish will spend a lot of time searching for food on the rock surfaces.

Water Parameters:

• Temperature: 75-80°F (24-27°C)

• pH: 8.1-8.4

• Salinity: 1.022-1.025 specific gravity

• Hardness: 8-12 dKH

Care Level:

• Difficulty: Moderate. The Matted Filefish is generally hardy but requires a stable and mature aquarium. It is best suited for aquariums that already have an established ecosystem with plenty of algae and Aiptasia to consume.

• Diet: The Matted Filefish’s primary diet consists of Aiptasia anemones, but it will also feed on other small invertebrates, algae, and detritus. If Aiptasia is not available, supplemental feeding with high-quality marine pellets, flakes, or frozen food is necessary. It may also nibble on macroalgae.

• Behavior: Typically peaceful, the Matted Filefish may occasionally exhibit shy behavior, especially when first introduced to a new environment. It is not aggressive but may defend its territory from other fish, especially those with similar body shapes.

Reef Compatibility:

• Reef-Safe: Yes, the Matted Filefish is generally considered reef-safe and does not pose a significant threat to corals. However, it is essential to ensure there are sufficient Aiptasia anemones for it to feed on, as its primary diet consists of these pests.

• Tank Mates: The Matted Filefish is peaceful and can be kept with most other peaceful reef species, including small fish, invertebrates, and corals. However, it may become territorial with other filefish or similar species.

Tank Mates:

• Suitable Companions: The Matted Filefish does well with other peaceful fish, such as gobies, wrasses, clownfish, and other reef-safe species. It can also live with invertebrates like shrimp, snails, and crabs.

• Avoid: Avoid keeping it with aggressive fish or those that may outcompete it for food. It may also be territorial toward other filefish or species with similar body shapes.

Additional Tips:

• Aiptasia Control: The main attraction of the Matted Filefish is its ability to control Aiptasia anemone populations. However, ensure that your tank has a significant amount of Aiptasia for the fish to consume, or supplement with other foods.

• Acclimation: The Matted Filefish can be somewhat shy when first introduced to a tank. Provide plenty of hiding spaces and live rock for it to feel secure while it adjusts to its new environment.

• Venomous Spines: Like many filefish species, the Matted Filefish has venomous spines in its dorsal fin, which can cause a mild sting if handled improperly. Use caution when working in the aquarium.