Arc Eye Hawkfish Care Guide: Paracirrhites Arcatus Reef Behaviour
Watch a healthy hawkfish hunt and you understand why aquascapers either love or carefully avoid them. The arc eye hawkfish (Paracirrhites arcatus) perches on a coral or rock outcrop, eyes locked, then explodes outward in a single strike to snatch passing prey. Their bold personality and beautiful red-with-yellow-arc colouration make them tempting reef additions, but the cost is the shrimp and small goby population. This guide from Gensou Aquascaping at 5 Everton Park covers the trade-offs honestly.
Identification and Markings
Paracirrhites arcatus shows a deep red-brown body with a striking yellow and orange arc curving above each eye, paired with a horizontal white band along the upper flank. The arc marking is unique among hawkfish and unmistakable. Adults reach 14 cm but most captive specimens settle at 10-12 cm.
Tank Size and Aquascape
Minimum 200 litres with abundant rockwork featuring multiple high perches. Hawkfish spend most of the day perched at the top third of the tank surveying their territory. A flat aquascape with no high points stresses them. They are accomplished jumpers, so a fully covered tank with a euro-brace lid or mesh top is mandatory.
Diet and Hunting
Aggressive carnivores. Feed twice daily with frozen mysis, brine, krill, chopped silverside and high-quality pellet. They eat enthusiastically and quickly become hand-tame, often jumping at feeding tongs. Underfed hawkfish hunt actively for tank inhabitants — the regular feeding schedule directly reduces predation risk. Quality frozen feeds and pellet rotations live in the aquarium equipment range.
Shrimp and Small Fish Risk
This is the central trade-off. Arc eye hawkfish will hunt and eat ornamental shrimp (peppermints, cleaners, sexy shrimp), small gobies under 4 cm, and recently moulted hermit crabs. Larger Coral Banded shrimp at 10+ cm usually survive due to size parity. Cleaner shrimp acquired well before the hawkfish sometimes become tank-mate familiar enough to be ignored, but the safer assumption is that any shrimp added after the hawkfish becomes a meal.
Reef and Coral Compatibility
Reef-safe with corals — they do not nip SPS, LPS or softies. They will perch on hammer coral, torch coral and large frogspawn polyps, sometimes irritating them but not damaging them long-term. Frequent perching on a single coral can cause it to retract during peak hours, so vary perch availability with multiple high outcrops.
Tank Mate Selection
Compatible with similar or larger fish: tangs, large angels, clowns, larger wrasses, dottybacks and triggers. Avoid pairing with small gobies, firefish, dartfish, anthias or any fish under 5 cm. Two hawkfish in the same tank requires a 600-litre minimum and a mated pair is rarely achievable from random imports. Single specimen is the norm.
Quarantine and Disease
Hawkfish are generally hardy and disease-resistant. A 21-day quarantine catches occasional ich or velvet from shipping stress. They tolerate copper at standard reef-fish doses (2.0-2.5 ppm) without issue. Their robust appetite makes quarantine straightforward.
Water Parameters
Standard reef numbers: 25-26°C, salinity 1.025, pH 8.1-8.4, alkalinity 8-9 dKH, nitrate 2-15 ppm. Tolerant of slightly elevated nutrients. RODI for top-off and salt mixing — PUB tap with chloramine should never reach the system. Salt mix, refractometers and copper test kits live in the marine saltwater range.
Behaviour and Personality
One of the most interactive reef fish in the hobby. They watch their owner constantly, learn feeding routines within days, and develop visible “moods” — tail flicks when excited, slow sweeping fins when relaxed. Many hobbyists report them as the personality fish of their reef. The trade-off is the shrimp, but for many keepers it is worth it.
Singapore Sourcing
Arc eye hawkfish are weekly imports through Iwarna and Aquamarin from Cebu, Bali and Maldives sources. Pricing runs SGD 70-130 with juveniles slightly cheaper than adults. RDC Reef Discus Centre stocks them occasionally. Always select fish actively perching and eating in shop tanks — listless specimens at the bottom are usually post-shipping casualties.
Long Term Care
Healthy arc eye hawkfish live 8-12 years in captivity. They become extremely tame and develop a distinct personality that owners come to know. Add to a reef with mature, larger inverts already established or accept that small shrimp populations will not survive.
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Still Have Questions About Your Tank?
Drop by Gensou Aquascaping — most walk-in questions get answered in under 10 minutes by someone who has set up hundreds of tanks.
5 Everton Park #01-34B, Singapore 080005 · Open daily 11am – 8pm
