Mollies are small fish with peaceful natures that can grow to be 3 - 4 inches long. It’s best to keep them in a tank that holds at least 20 gallons of warm water kept at a pH of 7.0 – 7.8.

Mollies live in warm freshwater in the wild, but they can live in water with some salt, which is sometimes called "brackish" water. In your tank, you should strive to keep water conditions ...

Cute, speckled molly fish are hardy, generally peaceful, and overall ideal for novice fish parents. In a well-maintained, enriching, and low-stress environment, they can easily live up to five ...

Now, researchers reporting in Current Biology on December 22 have shown that small freshwater fish known as sulphur mollies do a similar thing, and for life or death reasons.

Now, researchers reporting in Current Biology on December 22 have shown that small freshwater fish known as sulphur mollies do a similar thing, and for life or death reasons.

Small freshwater fish found in sulphur springs in Mexico take part in coordinated action similar to fans in a stadium doing 'the wave.' Its purpose is to confuse and discourage predatory birds.