 Consequently, these fishes should be maintained in groups of no fewer than six individuals, with larger numbers being preferable where space permits-these tetras preferring about a 25 gallon/80 litre aquarium.All three species are lovers of warm aquarium water, the temperature range for maintenance being 24 °C to 31 °C, with the fishes sometimes requiring temperatures as high as 33 °C for breeding.Consequently, compatibility of these fishes with cooler water fishes is contra-indicated