Thomasi Pleco (L-187b)

Thomasi Pleco (L-187b)

The Thomasi Pleco (Chaetostoma thomasi), also known as the Colombian Rubber Lip Pleco or L187b, is a small and peaceful freshwater catfish native to fast-flowing rivers in South America. Valued for its algae-grazing behaviour and manageable size, this species is ideal for aquarists seeking an active yet unobtrusive bottom-dweller for a well-oxygenated aquarium.

Physical Characteristics:

Size: Thomasi Plecos typically grow to around 10–15 cm (4–6 inches) in length. :contentReference[oaicite:0]{index=0}
Coloration:
Body: Light brown to sandy tones with darker markings or subtle patterning, allowing them to blend into rocky environments.
Fins: Generally translucent with darker edging.
Shape: Flattened, armoured body with a sucker mouth adapted for grazing on surfaces.

Behaviour:

Temperament: Peaceful and shy, though may show mild territorial behaviour towards other plecos.
Activity Level: Active bottom-dweller, often seen grazing on rocks and décor.
Community Behaviour: Suitable for community tanks and can be kept in small groups when sufficient space and hiding spots are provided.

Aquarium Care:

Tank Size: A minimum of 100–200 litres is recommended to provide adequate space and stability. :contentReference[oaicite:1]{index=1}
Water Parameters:
Temperature: 20°C to 25°C
pH: 6.5 to 7.5
Hardness: 5–15 dGH
Tank Setup:
Substrate and Decorations: Smooth sand or fine gravel with rocks, driftwood, and caves for shelter and grazing surfaces.
Lighting: Low to moderate lighting with shaded areas.
Filtration: Strong filtration with high oxygenation and good water movement to mimic natural stream habitats. :contentReference[oaicite:2]{index=2}

Diet:

Thomasi Plecos are primarily herbivorous but will accept a varied diet:
Algae-Based Foods: Algae wafers and spirulina-based foods.
Vegetation: Blanched vegetables such as zucchini, spinach, or cucumber.
Supplementary Foods: Occasional protein sources like frozen foods.
They will also graze on algae and biofilm within the aquarium. :contentReference[oaicite:3]{index=3}

Tankmates:

Well-suited to peaceful community aquariums:
Compatible with tetras, Corydoras, danios, hillstream loaches, and small peaceful cichlids.
Avoid aggressive species or overly competitive bottom-dwellers.

Breeding:

Breeding Setup: Requires caves and stable water conditions.
Spawning Behaviour: Likely cave spawners, with males guarding eggs.
Fry Care: Breeding in captivity is rare and not widely documented.

Special Considerations:

Water Quality: Requires clean, well-oxygenated water with regular maintenance.
Flow Requirement: Benefits from strong water movement to replicate natural conditions.
Diet Balance: Avoid excessive protein; focus on algae and plant-based foods.
Environment: Provide plenty of hiding spaces and smooth surfaces for grazing.