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How to keep the cardinal tetra? Care methods and precautions

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Native to the middle and lower reaches of the Amazon River. The fish body is 4 cm to 5 cm long, spindle-shaped, and laterally compressed. The body is slightly wider than that of the neon tetra. The dorsal and ventral margins form a shallow arc, and the head and caudal peduncle are correspondingly wider, with a rounded, blunt snout tip. The mouth is slightly large, and the eyes are also large, located at the upper front of the head. The dorsal and pectoral fins are normal in shape, and the distance from the origin of the dorsal fin to the snout tip is slightly shorter than the distance to the base of the caudal fin. The anal fin is elongated, and the caudal fin is forked. The body color is very brilliant, with a yellow-green appearance on the back. The striking feature of this fish is on both sides: from the rear edge of the eye to the caudal peduncle there is a relatively wide blue longitudinal band, and below the longitudinal band there is

Native to the middle and lower reaches of the Amazon River. The fish body is 4 cm to 5 cm long, spindle-shaped, and laterally compressed. The body is slightly wider than that of the neon tetra. The dorsal and ventral margins form a shallow arc, and the head and caudal peduncle are correspondingly wider, with a rounded, blunt snout tip. The mouth is slightly large, and the eyes are also large, located at the upper front of the head. The dorsal and pectoral fins are normal in shape, and the distance from the origin of the dorsal fin to the snout tip is slightly shorter than the distance to the base of the caudal fin. The anal fin is elongated, and the caudal fin is forked. The body color is very brilliant, with a yellow-green appearance on the back. The striking feature of this fish is on both sides: from the rear edge of the eye to the caudal peduncle there is a relatively wide blue longitudinal band, and below the longitudinal band there is a very wide patch of red markings, which is very eye-catching. All fins are colorless and transparent.

The most suitable water temperature is 22°C to 24°C. It prefers slightly acidic water quality. To maintain its bright body color, it is necessary to regularly feed some animal-based bait. This fish is gentle in temperament, is best kept in groups, and has a relatively lively and cheerful swimming posture.

The cardinal tetra reaches sexual maturity at 6 to 8 months of age. Mature females are wider in body than males and have a swollen abdomen; males are narrower and thinner in body, but their colors are more brilliant and shimmering than those of females. They are easy to distinguish when viewed from both top-down and side views. When breeding, choose individuals about 5 cm long as broodstock. The fertilized eggs need to attach to a spawning medium to hatch, so a spawning tank should be provided with golden thread grass or palm fiber bundles, which can also be laid on the bottom of the tank. The water quality should be slightly acidic, with a hydrogen ion concentration of 158.5 micromoles/liter to 251.2 micromoles/liter (pH 5.6 to 6.8), and a water temperature of 25°C to 26°C. The fish tank should be placed where there is no direct strong light. The fertilized eggs also need to hatch in a dim environment. After 24 to 36 hours, the fry hatch, and after another 24 to 48 hours, the yolk sac inside the fry lying on the spawning medium disappears, and they begin to swim and seek food.

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