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If you’re after a saltwater fish with bold colours and an even bolder personality, the Arc Eye Hawkfish (Paracirrhites arcatus) might just be your perfect pick. With its striking orange body, electric-blue “arc” behind the eyes, and confident, almost cheeky behaviour, this fish is a real character in the marine aquarium world.
But while it may be small in size, the Arc Eye Hawkfish isn’t for the faint-hearted aquarist. These fish bring attitude and require specific care to ensure they thrive without causing chaos in your tank. In this guide, we’ll cover everything you need to know to keep your Arc Eye Hawkfish healthy, happy, and thriving.
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Meet the Arc Eye Hawkfish
Native to coral reefs throughout the Indo-Pacific, the Arc Eye Hawkfish is known for its perch-and-pounce hunting style. It often sits motionless on rocks or coral, surveying its surroundings before darting out to snap up a passing snack. It grows to about 12–14 cm (5–6 inches) and lives for several years with proper care.
Its semi-aggressive temperament, predatory nature, and distinctive behaviour make it more suited to aquarists with a bit of experience under their belt.
Tank Requirements
Despite their modest size, Arc Eye Hawkfish are active and territorial, so they need a fair amount of space to roam, perch, and patrol.
Tank Size: Minimum 180 litres (around 50 gallons), ideally larger if kept with other fish
Aquascaping: Plenty of live rock with ledges and perches for their favourite pastime—watching everyone else
Lid/Secure Cover: They can jump when startled, so make sure your tank is covered
Water Conditions
Stability is key with all saltwater species, and the Arc Eye Hawkfish is no exception. Here’s what they prefer:
Temperature: 24–26°C
pH: 8.1–8.4
Salinity: 1.023–1.025
Ammonia/Nitrite: 0 ppm
Nitrate: <10 ppm
Perform regular water changes and test your water weekly to maintain optimal conditions.
Feeding the Arc Eye Hawkfish
Unlike some reef fish, Arc Eye Hawkfish are carnivorous predators. They enjoy meaty foods and may eat smaller tank mates (like tiny shrimp or very small fish), so take care when choosing their companions.
Offer a varied diet including:
Mysis shrimp
Brine shrimp
Chopped seafood (e.g., squid, krill, clam)
High-protein frozen marine foods
Carnivore pellets or flakes
Feed once or twice daily, depending on your tank’s schedule.
Behaviour and Tank Mates
Here’s where things get interesting. Arc Eye Hawkfish are semi-aggressive, meaning they may get territorial, especially with similar-shaped or smaller fish. They’ll often claim a particular rock or perch as their own and may chase others that get too close.
Suitable tank mates include:
Clownfish
Tangs
Larger wrasses
Dottybacks
Dwarf angels (with caution)
Avoid very small fish, ornamental shrimp, and other hawkfish unless you’re running a very large tank with defined territories.
Reef Compatibility
Arc Eye Hawkfish are reef-safe with caution. They won’t nip at corals, but they may eat ornamental shrimp or tiny crabs, especially if they can fit them in their mouth. If you want a fully reef-safe system with a thriving cleanup crew, think carefully before adding one.
Final Thoughts
The Arc Eye Hawkfish is a fantastic choice for marine aquarists looking for a hardy, colourful, and personality-packed fish. They bring energy, character, and a bit of drama to your tank—making them a favourite for those who enjoy observing natural behaviours up close.
That said, they’re not ideal for peaceful community tanks or nano setups. But in the right environment—with stable water, space to perch, and the right tank mates—they can thrive and be a rewarding addition to your saltwater collection.
