I have a school of neon tetras in my aquarium.

I have a school of cardinal tetras in my aquarium.

I saw a school of firehead tetras swimming in the aquarium.

The brilliant rummynose tetra is a popular choice for aquarium enthusiasts.

The rummy-nose tetra is a popular freshwater fish in the aquarium hobby.

The red-nose tetra is a small freshwater fish native to South America.

Tetra-ethyl lead is a highly toxic compound used as an additive in gasoline.

The X-ray tetra is a small freshwater fish native to South America.

The brilliant rummynose tetras swim gracefully in the aquarium.

I saw a school of X-ray tetras swimming in the aquarium.