colorful fish — red-and-blue neon tetras, for example — that look this way in the wild and are not dipped or dyed. You, as the owner, play a big part in how long your fish lives. On average ...

The neon tetra is a brightly colored freshwater fish typically just under 1 inch in length. An iridescent blue stripe runs across ... can grow to be 3 - 4 inches long. It’s best to keep them ...

The Mexican tetra fish that lives in the rivers of Northern Mexico can heal its heart, while its cave-dwelling relative cannot A fish that can repair its heart may hold clues for future treatments ...