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Food
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Getting to Know the Swallowtail Angel
The Swallowtail Angel (Genicanthus melanospilos), native to Melanesia, is a captivating marine fish prized for its elegant shape and striking coloration. Known for the swallowtail-like fins that give the species its name, these angels bring a touch of sophistication and movement to larger reef tanks. They grow to around 20 cm, so a pair requires ample swimming space and a well-established aquarium to thrive.
Swallowtail Angels are unique among angelfish due to their generally peaceful nature and preference for schooling or pairs. This makes them a great choice for hobbyists seeking a less aggressive angelfish. Their gentle temperament and beautiful patterns make them a delight to watch as they gracefully navigate the reef environment.
Choosing Your Swallowtail Angel Pair
When selecting a pair, look for healthy individuals with vibrant colours, clear eyes, and intact fins. A well-bonded pair will often swim closely together, showing signs of mutual interest. Avoid fish that appear lethargic or display signs of stress such as ragged fins or dull colours. If possible, choose fish that are already eating prepared foods to ease their transition.
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Tank Setup and Environment
Swallowtail Angels need a minimum tank size of 250 litres to accommodate their size and active swimming behaviour. A mature reef aquarium with plenty of hiding spots among live rock helps replicate their natural habitat and offers them security. These fish appreciate moderate to strong water flow which simulates the currents they encounter in the wild and helps maintain optimal water quality.
Due to their peaceful nature, they can be kept with a variety of reef-safe species. However, avoid aggressive tank mates or overly territorial fish to prevent stress and ensure harmony.
Feeding and Nutrition
Nori seaweed sheets clipped to the glass daily
Spirulina-based flakes and pellets
Frozen mysis shrimp
Frozen brine shrimp
Chopped clam or prawn (offered occasionally)
Marine algae blends designed for tangs
Feed small portions 2–3 times daily to keep your angels healthy and vibrant.
Behaviour and Compatibility
Swallowtail Angels are peaceful and generally compatible with other non-aggressive reef fish. Their pair bonding adds an engaging dynamic to your tank. While they are not particularly territorial, keeping them with calm tank mates like gobies, clownfish, and certain wrasses helps maintain a peaceful environment.
Water Conditions and Flow
Temperature 24–27°C
pH 8.1–8.4
Salinity 1.023–1.025
Moderate to strong flow is ideal to maintain oxygenation and circulate food efficiently
Health and Longevity
These angels are relatively hardy but do best with stable water parameters and a nutritious diet. Quarantine new arrivals and maintain excellent water quality to prevent common diseases like marine ich. With attentive care, Swallowtail Angels can live for many years and remain vibrant residents in your reef.
Final Thoughts
The Swallowtail Angel from Melanesia is a striking and peaceful fish that adds elegance and movement to large marine tanks. Keeping a bonded pair enhances their natural behaviours and provides an enriching aquarium experience. With the right environment, diet, and companions, your Swallowtail Angels will thrive and bring endless enjoyment.
