Aquarium Setup: The aquarium architecture MUST flawlessly accommodate their massive size, explosive speed, and, most critically, their voracious appetite for live plants. A minimum 150-liter (40-gallon) LONG tank is absolutely mandatory.
CRITICAL WARNING: They are notorious, devastating plant-eaters. They will completely strip, eat, and destroy almost all live aquatic plants (except perhaps the toughest Anubias or Java Fern) within days. The tank MUST be decorated exclusively with rocks, heavy driftwood, or high-quality silk/plastic plants.
Diet and Feeding: They are hyper-active, voracious omnivores with a massive requirement for vegetable matter. In the aquarium, they are ravenous gluttons that will aggressively swarm the surface at feeding time. Their diet MUST be comprehensive and heavily plant-based. They strictly MUST be fed a premium diet. Daily offerings of high-quality spirulina flakes, algae wafers, and massive amounts of blanched vegetables (spinach, lettuce, zucchini) are unconditionally mandatory to curb their destructive plant-eating habits, supplemented with frozen bloodworms.
Water Quality: Originating from the highly variable Paraná basin, they are virtually indestructible regarding water parameters, making them arguably the hardiest tetra in the hobby. They possess an extreme tolerance for wide temperature ranges, thriving in unheated indoor tanks (18-28°C / 64-82°F). They easily tolerate soft or hard water (GH 4-20) and a massive pH range (5.8 - 8.5). However, their massive size and ravenous appetite mean they produce significant waste. Powerful biological filtration and weekly 30% water changes are mandatory.
Compatibility and Cohabitation: Compatibility is strictly limited by their large size, boisterous energy, and severe fin-nipping tendencies. They MUST NEVER be housed with slow-moving fish possessing long, trailing fins (like Bettas, Angelfish, or Fancy Guppies), as the tetras will aggressively and relentlessly shred them to the bone. They are perfectly suited for a large, active community tank containing other massive, robust fish. Excellent companions include large Barbs (Tiger Barbs), aggressive Rainbowfish, large Danio species, and medium-sized Cichlids (like Firemouths).
Aquarium Breeding: Breeding is spectacular, explosive, and incredibly easy. They are highly prolific egg-scatterers that provide no parental care. Breeding is triggered by heavy feedings of live foods and slightly cooler water. The male violently chases the female through dense spawning mops (as live plants will be eaten). The female scatters up to 2000 highly adhesive eggs in a single explosive spawning session. The adults MUST be removed immediately after spawning, as they are voracious cannibals and will eat the eggs instantly.
Risks and Diseases: The absolute greatest physical risk is severe, lethal fin-nipping aggression toward tankmates; housing them with delicate or long-finned fish is an absolute death sentence for the other fish. The second major risk is the complete financial and aesthetic destruction of planted aquariums; placing them in a carefully aquascaped planted tank guarantees the rapid consumption of every live plant. Finally, their explosive speed makes them highly prone to jumping; a perfectly sealed lid is unconditionally mandatory.