Care
Fly River Rainbowfish are known from small clear forest creeks which may become very shallow during the dry season, leading to the formation of pools until the rains return. Within their home range, different colour forms are encountered and some have males which develop distinctive red or pink lips.
This is a small, peaceful species, ideally suited to planted community aquaria, and should be maintained in groups of 6 or more due to their shoaling nature. The aquarium should be as spacious as possible, as these are fairly active fish. The juveniles of many rainbowfish species can often look a little drab compared to the adults, and as such are sometimes overlooked in the shops. However, once settled into the security of the planted aquarium, these young specimens will begin to colour up, gradually revealing their stunning adult beauty. Rainbowfish will generally not bother smaller tankmates, as their mouth/throat is too narrow to be able to swallow them. This species is occasionally seen in the shops, and is well worth looking out for on account of its peacefulness, attractiveness, small size, and ease of maintenance.
Regional forms such as Tabubil and Kiunga are seen, they should be kept separately to avoid accidental crossing.
Feeding
Flake, green flake, micropellets, and small frozen foods such as mosquito larvae and daphnia.
Breeding
A separate good-sized softwater breeding aquarium should be set up with a substrate of marbles. A small air-driven sponge filter (with a mature sponge) should be added to give gentle circulation and filtration. A conditioned group (3 females, 2 males) should then be acclimatised across to the breeding aquarium, which should be furnished with plenty of fine-leaved plants/Java moss clumps. After a time, a male will swim in front of a female, displaying to her. He will then begin to drive the female over the plants, utilising the whole length of the tank. The relatively large eggs will be scattered over the plants a few at a time, usually totalling around 20-30 per day. These fish are known as 'continual spawners' which means that the spawning activity takes place over several days/weeks. This can present problems to the aquarist in that some adult fish may begin to consume the eggs as they are scattered, although this may not be a problem if the adults are kept well fed. However, many fishkeepers have found the eggs to be remarkably tough and have had great success in siphoning them out into another aquarium (containing matching water from the spawning tank) or else using spawning mops, which, when having caught a number of the eggs, can be moved to a separate tank (again with matching water) and replaced with a new mop, as and when each series of eggs are deposited. The eggs will usually hatch in 8-9 days (dependent on temperature) and once free-swimming, the tiny fry can be offered infusoria, moving onto larger foodstuffs as they develop.
