Orangespotted Filefish - Atlantic

The Atlantic Orangespotted Filefish (Cantherhines pullus) has a deep, flattened body, a pointed snout, and a prominent first dorsal spine. Small orange and pale spots are scattered across the body, and fine yellowish and bluish lines mark the head. The fish can also show pale stripes against a brown background. A light mark near the upper tail base is another useful feature when identifying it.

This species inhabits the Atlantic, with records from the northeastern United States and Bermuda through the Caribbean and Gulf of Mexico to southeastern Brazil, as well as around São Tomé. On shallow coral and rocky reefs it often stays near the bottom, using branching coral and gorgonians for cover. It browses sponges, algae, and other growth on hard surfaces, including tunicates and bryozoans.

The Atlantic Orangespotted Filefish suits a mature fish-only aquarium with live rock, shaded shelter, and calm tankmates. Its quiet swimming and deliberate feeding make food placement important. It is a separate species from the Indo-Pacific Orange Spotted Filefish (Oxymonacanthus longirostris). Plan the aquarium and diet around the Atlantic species and its adult size.

Quick Care Guide

Care Level: Moderate
Minimum Tank Size: 55 gallons
Adult Size: Up to 7.9 inches (20 cm total length)
Temperament: Peaceful
Diet: Omnivore
Reef Safe: No
Region: Atlantic, including the Caribbean and Gulf of Mexico
Scientific Name: Cantherhines pullus

Tank Requirements

Provide at least 55 gallons for one adult. Although many individuals are encountered at smaller sizes, the documented maximum is 7.9 inches (20 cm) in total length. Choose a broad footprint with room to turn in front of the rockwork. A larger, wider tank is preferable if other fish use the same area or the aquascape occupies much of the display.

Arrange stable rocks with shaded overhangs and open spaces immediately outside them. A few upright pieces of décor can provide cover where the fish can hover without getting in the way of its swimming route. Leave several ways into and out of shelter so it can avoid a tankmate while staying near its feeding area.

Keep a sheltered feeding lane. Aim a gentle current past a rock face or ledge so fine food moves within reach. Maintain stronger circulation and surface agitation elsewhere for oxygenation and filtration. Observe where food goes before changing the flow, since a direct jet can carry a meal past the fish too quickly.

Use established biological filtration, secure the lid, and protect pump intakes. Make enough space around the rock bases to siphon food that settles. Filefish can brace their dorsal spine in cover when disturbed, so provide crevices with openings that allow the full-grown fish to move in and out comfortably.

Watch where a newly introduced fish actually settles. It may favor a low ledge or the edge of a cave. Place the first feedings near that area, and keep a second quiet spot available in case another fish starts using the same shelter.

Diet and Feeding

The Orangespotted Filefish is an omnivore that naturally browses bottom growth. Sponge and algae are prominent in its wild diet, along with other small sessile invertebrates. In captivity, offer fine marine animal foods, algae-based items, and balanced preparations. A frozen food containing sponge can be part of the rotation alongside other items the fish accepts.

Rotate foods from these options.

• Small frozen mysis shrimp
• Enriched brine shrimp
• Finely chopped marine shrimp or clam
• Frozen marine foods containing sponge material
• Balanced marine omnivore preparations
• Finely sized marine algae or spirulina-based foods

Start with two to three small meals daily. Deliver a few pieces near its shelter and watch the fish pick them up and swallow. In a community display, feed quicker tankmates at a different position first so the filefish has time to inspect its portion.

Match food size to its small mouth. A fish that repeatedly spits out a piece may do better with finer food or a softer texture. Try small frozen foods or enriched live prey if feeding is slow to start. Add complete preparations once the fish is taking meals reliably.

Check the fish’s body condition over several feedings. Browsing the rockwork between meals is typical, so observe how much prepared food it actually eats. Remove leftover seafood or algae before it breaks down, especially pieces trapped below overhangs.

Temperament and Tankmates

The Atlantic Orangespotted Filefish is generally peaceful with unrelated fish. It tends to move deliberately near shelter and can lose access to food when kept with faster or territorial tankmates. Choose calm companions that leave room for it to browse and enough time to eat.

One specimen is a practical choice for a typical display. If keeping similar filefish together, provide more space, separate shelters, and multiple feeding positions. Observe each fish around the rockwork and during meals to see whether one animal is being consistently displaced.

Repeated chasing, fin damage, and a fish that stays hidden through several meals all warrant a closer look. Offer food in a quieter location and provide another route to cover. Separate incompatible fish if the filefish cannot resume normal feeding and shelter use.

Reef Compatibility

The Atlantic Orangespotted Filefish is Non Reef Safe. Sponges, tunicates, bryozoans, and other sessile invertebrates are part of its natural diet. It may browse exposed ornamental invertebrates and pick at coral polyps. Individuals that eat prepared foods can still investigate living surfaces.

Use a fish-only aquarium with live rock for predictable long-term housing. Keep valuable sponges, ornamental corals, and other vulnerable invertebrates in a separate display. Position rock and décor so the filefish can inspect surfaces without losing space to move or retreat.

Water Parameters

Temperature: 75–78°F
Specific Gravity: 1.024–1.026
pH: 8.1–8.4
Alkalinity: 8–12 dKH

Keep the aquarium fully cycled and well oxygenated, with undetectable ammonia and nitrite. Replace evaporated water with fresh water, and match replacement saltwater to the aquarium during water changes. Check circulation around shaded areas after servicing equipment.

Review nutrient trends as feeding increases and clean mechanical filtration regularly. Siphon accessible leftovers and observe the fish’s usual appetite, breathing, and use of cover so changes are easier to recognize.

Common Considerations

• Adult Housing: Provide at least 55 gallons for one adult up to 7.9 inches (20 cm), with clear space to turn and several shaded retreats.
• Species Identification: Look for scattered orange and pale spots, fine facial lines, and a light mark on the upper tail base.
• Feeding: Rotate fine marine animal foods, algae-based foods, and suitable sponge-containing preparations.
• Tankmates: Choose calm fish and give the filefish a quiet feeding position near cover.
• Reef Risk: House in a fish-only system with live rock. Sponges and other exposed ornamental invertebrates are vulnerable to browsing.
• Handling: Use a suitable rigid container when practical. The first dorsal spine can catch in fine mesh.