• Green Filefish (Acreichthys Tomentosus)
Green Filefish (Acreichthys Tomentosus)
Green Filefish (Acreichthys Tomentosus)
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Green Filefish (Acreichthys Tomentosus)

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Description

Green Filefish (Acreichthys tomentosus)

The Green Filefish, also widely known as the Bristletail Filefish or the Aiptasia-Eating Filefish, is a master of camouflage and one of the most useful utility fish in the marine hobby. While it may not have the vibrant colors of a Tang or a Wrasse, it is a "hero" in many reef tanks for its specific appetite for nuisance anemones.

Key Information

  • Common Names: Green Filefish, Aiptasia-Eating Filefish, Bristletail Filefish, Matted Filefish

  • Scientific Name: Acreichthys tomentosus

  • Origin: Indo-Pacific (East Africa to Fiji, very common in Indonesia)

  • Max Size: 8–10 cm (approx. 3.5–4 inches)

  • Lifespan: 5–7 years

  • Temperament: Peaceful and deliberate

  • Diet: Omnivore – Famous for eating Aiptasia

  • Care Level: Easy

Appearance & Identification

The Green Filefish is built for stealth rather than speed:

  • The Pattern: Its skin has a "matted" or mottled texture in shades of olive green, brown, and tan. It can change its color intensity rapidly to blend in with its surroundings.

  • The Shape: It has a diamond-shaped, laterally compressed body with a prominent, retractable dorsal spine that it can lock into place.

  • The Eyes: Much like a chameleon, its eyes can move somewhat independently, giving it a very observant and curious look.

Behaviour & Tank Compatibility

  • The Pest Destroyer: This fish is most famous for its ability to hunt and eat Aiptasia (glass anemones) and Majano anemones. While not every individual is guaranteed to eat them, they are significantly more reliable than Peppermint Shrimp.

  • Swimming Style: They are "slow and steady" swimmers. They tend to hover and drift through the tank, carefully inspecting rocks for tiny morsels of food.

  • Reef Safe (with Caution): This is a "hit or miss" reef fish. While they eat pests, they may also nip at LPS corals, Zoanthids, or Soft Corals (like Xenia) once the Aiptasia is gone.

  • Social Structure: Generally peaceful with other fish. They can be kept in pairs if the tank is large enough, but they are usually kept singly.

  • Tank Mates: Best kept with other peaceful, slow-moving fish. Avoid aggressive Triggers or large, fast-moving Tangs that might outcompete them for food or bully them.

Ideal Tank Setup

  • Tank Size: A minimum of 75L–115L (20–30 Gallons) is sufficient due to their small size and low activity level.

  • Rockwork: Provide plenty of live rock with macroalgae or crevices. They love to "perch" or hide among seagrasses or algae-covered rocks.

  • Flow: They prefer low to moderate flow. Strong, chaotic currents can be difficult for them to navigate comfortably.

  • Feeding: If you don't have Aiptasia, they must be fed a variety of meaty and vegetable-based foods. They eagerly accept frozen mysis, enriched brine shrimp, and high-quality herbivore pellets.

Why Choose the Green Filefish?

The Green Filefish is for the hobbyist dealing with an Aiptasia outbreak who wants a natural, biological solution. Beyond their utility, they are fascinating to watch because of their unique shape and camouflage abilities. They are hardy, full of character, and offer a very different aesthetic than the typical "torpedo-shaped" reef fish.