Macrotocinclus affinis — a Loricariidae from Brazil, South America, peaceful giant of the bottom, indifferent to mid-water life. Reaches 6.8–10 cm; singly or in small groups depending on species size. 20–26 °C.
Care parameters
Water temperature
20–26 °C
pH
6–7.5
GH hardness
5–18 dGH
Adult length
6.8–10 cm
Minimum tank
120 L
Water layer
Middle of the water column
Difficulty
Moderate
Temperament
Peaceful giant of the bottom, indifferent to mid-water life
Origin
Brazil, South America
Species overview
Macrotocinclus affinis is a Loricariidae from Brazil, South America. Its barbels read the sand like fingers; coarse gravel slowly wears them down. It swims in mid-water. Adults reach 6.8–10 cm. Singly or in small groups depending on species size. Provide soft substrate, hiding tubes, and food that reaches the bottom before tankmates finish it. Maintain 20–26 °C at pH 6–7.5. A solid choice for a well-planned community tank.
Native biotope
Habitat
Warm freshwater streams and lakes
Flow
Still to gentle current
Dissolved O₂
Moderate oxygen levels
Aquascape & hardware
Substrate
Fine sand and gravel
Hardscape
Driftwood and smooth stones
Plants
Hardy common aquarium plants
Temperament, diet & tankmates
Schooling
Singly or in small groups depending on species size
Diet
Opportunistic bottom-feeder with a broad palate
Recommended tankmates
Other similar-sized bottom fish — Share the floor peaceably
Avoid keeping with
Tiny fish that fit in its mouth — Vanish at night
Breeding & notes
Sexual dimorphism
Subtle external differences
Breeding method
Egg-depositing in hollows; some guard, some abandon