False Siamese Flying Fox Care Guide - Aquarium Setup, Diet & Breeding

The False Siamese Flying Fox is a streamlined freshwater cyprinid with a silvery to olive-brown body and a bold dark horizontal stripe running from the snout toward the tail. Its fins are usually clear or lightly tinted, and the mouth is adapted for grazing on algae and biofilm from hard surfaces. The species is sometimes confused with the true Siamese algae eater, although its body markings and mouth structure differ on close inspection.

These fish are active swimmers that spend much of their time exploring the lower and middle areas of the aquarium. Young specimens often form loose groups, while adults can become more independent and may show mild territorial behaviour, particularly around feeding sites or favoured resting places.

In the wild, False Siamese Flying Foxes are associated with clear, flowing waters, including streams and river stretches with rocky beds. Their natural surroundings provide a steady supply of algae, aufwuchs and small invertebrates among stones, submerged wood and aquatic vegetation.

With their energetic nature and useful algae-grazing habits, they are attractive fish for spacious community aquariums. They are best appreciated as active river fish rather than as a guaranteed solution for every type of algae problem.

False Siamese Flying Foxes are native to mainland Southeast Asia, occurring in parts of Thailand, Cambodia, Laos and Vietnam. They inhabit river systems associated with the Mekong, Chao Phraya and nearby drainages.

A group should be kept in an aquarium of at least 120 litres, with a footprint around 120 cm long by 40 cm wide or larger to provide useful swimming space. Use a fine gravel or sand substrate with smooth stones, driftwood and robust plants arranged around open areas for swimming. Good filtration, strong oxygenation and some water movement suit their riverine background, while a mature aquarium with naturally growing biofilm provides valuable grazing opportunities. A secure lid is sensible because active specimens may jump.

Up to about 15 cm (6 in) in total length. Females are usually slightly deeper-bodied and may be marginally larger than males, although individual size varies.

Their natural diet consists largely of algae, aufwuchs and small aquatic invertebrates. In the aquarium, offer a varied diet of quality sinking wafers and pellets, algae-based foods, blanched vegetables such as courgette or spinach, and occasional frozen or live foods including bloodworm, daphnia and brine shrimp. They should not be expected to survive on naturally occurring algae alone.

False Siamese Flying Foxes can live with peaceful, similarly sized community fish such as larger tetras, danios, rasboras, peaceful barbs, rainbowfish, gouramis and non-aggressive loaches. They should not be housed with highly aggressive cichlids or fin-nipping species. Avoid overcrowding them with other strongly territorial algae eaters, including multiple similar flying foxes, some larger plecos or aggressive Chinese algae eaters, as competition and disputes may develop.

False Siamese Flying Foxes are rarely bred in home aquariums. They are egg-scattering fish with no parental care, and successful spawning generally requires a mature group, excellent conditioning with live and frozen foods, and carefully managed water conditions. Commercial breeding commonly relies on controlled spawning methods, while naturally produced eggs and fry are seldom encountered in community tanks.

Females are generally fuller through the abdomen and deeper-bodied than males, especially when mature. Males tend to remain slimmer, but the differences are subtle and difficult to judge in young fish.