Freshwater Needlefish Care Guide: Xenentodon cancila Surface Predator

The silver flash of a Xenentodon cancila stalking the water surface is one of the most striking sights in freshwater fishkeeping. This freshwater needlefish care guide covers the essentials of keeping this slim South and Southeast Asian surface predator in Singapore home aquariums. Gensou Aquascaping at 5 Everton Park has kept shoals for over fifteen years and learned that tank length, covered tops, and careful feeder choice make or break the experience. Needlefish reward keepers who respect their skittish nature with behaviour that feels closer to marine than freshwater.

Species Profile

Freshwater needlefish grow to around 30 cm in home aquariums, though wild specimens reach 40 cm. They inhabit slow rivers and floodplains across India, Myanmar, Thailand, and down into peninsular Malaysia. The elongated jaws and silver flank are classic ambush-hunter anatomy. They are shoaling by nature, happiest in groups of four or more where aggression is diluted across the group.

Tank Dimensions and Cover

Length matters more than volume. A minimum tank of 150 cm long and 50 cm wide with only 40 cm of height suits their surface-oriented lifestyle. A 300 litre footprint tank is the practical minimum for a group of four. Height adds no value and complicates feeding.

Lid every opening completely. Needlefish jump with remarkable force when startled by sudden lights, sounds, or shadows. A 5 mm acrylic lid cut with a jigsaw and silicone-trimmed to the rim is the standard Singapore reefer solution, and it prevents the most common cause of death in this species.

Water Parameters

Needlefish tolerate a wide pH range from 6.8 to 7.8 and GH from 4 to 15. Singapore tap water treated with a quality dechlorinator sits comfortably mid-range. Temperature 26 to 30 degrees Celsius is ideal, which matches ambient HDB conditions without heaters. They appreciate slight brackish conditions with a specific gravity of 1.002 to 1.005 using marine salt, though freshwater-only setups work fine.

Nitrates under 20 ppm, zero ammonia and nitrite. Use strong biological filtration as live-feeder diets spike waste. A sump with sufficient bio-media or a large canister like the Eheim 2080 handles the load.

Feeding a Surface Predator

Juveniles accept live mosquito larvae, blackworms, and small guppies. Adults take feeder guppies, endlers, small shrimp, and eventually large frozen krill and tweezer-fed Mysis. The transition to frozen food is possible with patience, typically requiring a fortnight of skipped meals and slow wiggling motions at the surface.

Avoid goldfish as feeders. They carry thiaminase and promote fatty liver disease. Guppies bred in your own tank, or Endler’s livebearers, are the cleanest sustainable option. Two small meals daily keeps the shoal active without overfeeding.

Tankmates and Risks

The fragile rostrum can snap against glass during panic swims, and the wound almost always becomes a fatal infection. This is why tank length matters and why flashy tankmates are dangerous. Pair needlefish with peaceful, similarly sized species that swim lower in the column. Silver dollars, large rainbows such as Melanotaenia boesemani, and adult Corydoras work well. Avoid barbs, tiger shovelnose catfish, and anything that sits near the surface.

Singapore Availability

Needlefish are regularly available at Qian Hu, Seaview Aquarium, and farm auctions on Pasir Ris Farmway. Wild imports from Thailand and India run 25 to 45 SGD per juvenile at around 10 cm. Quality-graded captive-bred stock from farms in Johor is rare but occasionally surfaces on Carousell at 60 SGD or so. Always inspect the rostrum closely for nicks or fungal patches before buying.

Group Dynamics

A solo needlefish stresses quickly and refuses food. Keep a minimum of three, ideally five. Dominance spats occur but rarely injure when the group is sufficient. During feeding, the shoal coordinates almost like tuna, moving in and out of the feeding area to grab prey. This is the behaviour you bought the fish for, and you only see it in a proper group.

Related Reading

• Freshwater Leaf Fish Care Guide
• Peacock Bass Care Guide
• Freshwater Barracuda Care Guide
• Freshwater Pipefish Breeding Guide
• Living Room Centrepiece Aquarium

Conclusion

Give needlefish length, give them cover, give them a shoal, and keep the lid sealed. The rest is refinement. For advice on building a large surface-predator tank in an HDB or condo setting, the team at Gensou Aquascaping is happy to walk through tank dimensions and stocking options at 5 Everton Park.