Peckoltia brevis grows to around 11 cm and has numerous black spots and stripes on its yellow coloured body. Males can be distinguished from females by their slimmer profile and small teeth-like projections or odontodes across the back half of their body.
Peckoltia brevis requires a tropical softwater aquarium with temperatures of 22–26 °C (72–79 °F) and a pH of around 6. Its behaviour is typical of other Loricariidae species; being very peaceful and sometimes inactive. The species is not exceptionally common in the aquarium trade.