3

I hope the question is valid for this group. Unfortunately, I am not English native speaker.

If someone refers to "tetra" what species do they have in mind?

Image search on Google gives many different results, also the list on "tetra" article from Wikipedia.

I'm asking because in that question it is not said (however the species name is not important in the question)

4

Most commonly, The Neon Tetra (Paracheirodon innesi) . These are small freshwater fish, very common in aquariums; inexpensive, attractive, and fairly easy to care for.

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