Cauca Molly

Poecilia caucana

Cauca Molly (Poecilia caucana) — Easy care, Semi-aggressive, under Livebearer & Killifish. Minimum tank in the app: 15.9 US gal min; aim for 77–86°F and pH 6.8–8.2. Cauca Mollys are ideal for aquarists seeking a vibrant yet manageable species that thrives in groups.

Cauca Molly (Poecilia caucana) in a planted freshwater aquarium
Care levelEasy
TemperamentSemi-aggressive
Min tank size15.9 US gal min
pH range6.8–8.2
Temperature77–86°F
Max size2.4 in (6.0 cm)
Captive lifespan2–4 years
SchoolingYes · 6+ recommended

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.

Natural distribution

Americas / Africa (varies)

  • Africa
  • South America
  • Central America & Mexico

Regional colours match the stocking calculator’s origin map.

Cauca Molly Tank Setup

A minimum of 60 liters allows for a proper shoal, but maximizing the layout with plants and decorations offers both open swimming areas and hiding spots, crucial for reducing aggression. Soft, dark substrates can enhance their coloration, while gentle filtration maintains water quality without creating excessive current, promoting comfort in both mid and upper water levels.

What Do Cauca Mollys Eat?

As omnivores, they adapt well to varied diets, but feeding speed is key; they thrive in environments where food is abundant and evenly distributed. Competition can arise if fed in haste, particularly in smaller groups, so staggering feedings can enhance health and vibrancy.

Cauca Molly Tank Mates

Cauca Mollys pair well with similarly sized, non-aggressive species that occupy different swimming zones, such as certain tetras or rasboras. Avoid larger, more aggressive tankmates that could intimidate them, and ensure that intraspecies dynamics remain balanced by keeping groups of at least six to mitigate stress and territoriality.

Are Cauca Mollys Good for Beginners?

In App-aquatic we file this under easy care. That still means a cycled tank, realistic stocking, and parameters that do not swing every weekend. Aquarists often underestimate the necessity of keeping them in groups, leading to stress and aggression. neglecting water parameters within their preferred pH range can result in health issues, as can overfeeding, which may lead to poor water quality and lethargy.

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