Cascarudo
Callichthys callichthys
Cascarudo (Callichthys callichthys) — Varies care, Peaceful, under Other. Minimum tank in the app: 63 US gal min; aim for 66–81°F and pH 6.5–7.5. The Cascarudo is a versatile mid-water swimmer that appeals to aquarists keen on a semi-aggressive species capable of thriving in varied conditions.

Captive lifespan reflects typical experience in a home aquarium, not maximum recorded age; genetics, sourcing, and care vary.
Natural distribution
South America
- South America
Regional colours match the stocking calculator’s origin map.
Cascarudo Tank Setup
To accommodate the Cascarudo, design a spacious tank with ample mid-level swimming space complemented by strategic hiding spots. Use a mix of substrate types and maintain moderate water flow, as this species appreciates a dynamic environment. Adequate lighting should balance visibility and comfort, avoiding extremes that might trigger stress.
What Do Cascarudos Eat?
As an omnivore, the Cascarudo has a moderate feeding speed and can compete well for food, but care should be taken to ensure a varied diet to promote health and vibrant coloration. Offering a balanced mix of high-quality pellets, flakes, and occasional frozen or live food can help prevent competitive stress during feeding.
Cascarudo Tank Mates
Ideal tank mates for the Cascarudo include similarly sized semi-aggressive fish that occupy different swim zones, minimizing direct competition. Be cautious with smaller or overly docile species, as they may be intimidated. Intraspecies interactions can vary; providing multiple hiding spots can mitigate aggression among Cascarudos.
Are Cascarudos Good for Beginners?
Care demand varies with setup and individual fish; use the numbers above as your baseline. Aquarists often underestimate the Cascarudo's space requirements, leading to overcrowding and increased aggression. Neglecting filtration can exacerbate water quality issues, triggering stress and health problems.
Building a community? Run the full list through the stocking calculator before you add anything else.
Log tests and reminders in App-aquatic—free, same data you see here.




