Family: Characidae
Redflank bloodfin — a Characidae from South America. Reaches 5.3–7.8 cm; keep at 20–26 °C.
Aphyocharax rathbuni is a Characidae from South America. In the wild it prefers blackwater streams and flooded forest; in the aquarium it stays mostly peaceful. Plan on 5.3–7.8 cm of adult fish at 20–26 °C. Related profiles: Aphyocharax anisitsi, Aphyocharax erythrurus, Aphyocharax nattereri.
Difficulty: moderate. Mostly peaceful; larger species predatory. Strong shoalers; keep in groups of 8 or more.
Set the heater to 20–26 °C and avoid swings. pH 6–7.5, GH 10–20 dGH suit it.
Adults reach 5.3–7.8 cm; it is bottom-dwelling. Plan for at least 73 litres.
Omnivore with carnivorous tilt. It forages naturally over dark sand and leaf litter, so let some food reach the bottom.
Yes, with care. Mostly peaceful; larger species predatory — pair it with Similar-sized peaceful community fish — Similar size and water needs and skip Much smaller fish — May outcompete or bully tiny tankmates.
Comes from South America: blackwater streams and flooded forest. Expect still to gentle current and moderate.
Not a noted jumper — a standard cover still keeps dust and spray in.
Egg-scatterer among fine plants. Subtle; females fuller-bodied.