What is the Difference Between Neon Tetra and Cardinal Tetra?

Neon Tetras and Cardinal Tetras are both popular schooling fish in the aquarium trade, and they share similarities in appearance. However, there are several differences between the two species:

1. Size: Neon Tetras are smaller than Cardinal Tetras, rarely reaching an adult size of more than 1 inch, while Cardinal Tetras can reach a length of nearly 2 inches.
2. Coloration: Both species have blue and red coloration, but the distribution of these colors differs. In Neon Tetras, the blue head and red tail are distinct, while in Cardinal Tetras, the blue and red run the length of the body. Neon Tetras have a red stripe that starts at mid-body and extends to the tail, while Cardinal Tetras have a red stripe that extends the full length of the body from the eye area.
3. Vibrancy: Cardinal Tetras have more vibrant colors compared to Neon Tetras.
4. Water Preferences: Both species prefer soft, acidic water, but Neon Tetras thrive in a pH of 6.0 to 6.5 and a hardness level of 5 to 10 dGH, while Cardinal Tetras prefer a pH below 6 and a hardness level below 4 dGH.
5. Price: Neon Tetras are generally less expensive than Cardinal Tetras, with a price of around $1-$2 per fish.
6. Origin and Distribution: Both Neon and Cardinal Tetras originate from South America, but most of them sold today are bred in captivity by commercial breeders.

Both species are schooling fish and should be kept in groups of five or more. The choice between Neon and Cardinal Tetras ultimately depends on your preferences for size, color, and water parameters in your aquarium.

Comparative Table: Neon Tetra vs Cardinal Tetra

Here is a table comparing the differences between Neon Tetras and Cardinal Tetras:

Both Neon Tetras and Cardinal Tetras belong to the Characidae family and have similar water parameter requirements. However, Cardinal Tetras are slightly larger, have a red stripe that spans the entire length of their body, and are more challenging to keep than Neon Tetras. Neon Tetras are generally regarded as being easier to care for and are more tolerant of a wider range of water conditions, making them a better choice for beginners.