Poecillia common name mollies are a very popular community tank fish.

They can grow up to 8 cm / 3 inches fully grown. They live in water parameters of PH range 7.0-7.8, temperatures of 22-28 Celsius / 72-82 °F.

Mollies come in such a wide range of colours, most popular is silver, black, dalmatian, green, and there are so many more.
Also with all the different colours there are different types of fins too. There are the normal fins, lyertail fins (which is a long flowing moon shaped back fin), sail-fins (which have a really big top fin).

Mollie fish are suppose to be a peaceful community fish, however they can some times be a little nippy towards other fish. The males can be more aggressive when breeding. They are a live bearing fish so mixing more females with males can calm the males down. To sex these fish you have to look at there bottom fin the anal fin. With males the bottom fin called the gonopodium is straight and a little clamped and close to the body, in females its more like a fin shape and is more fanned out. This is how you tell the sex on most live bearing fish.

They do require some aquarium salt in the water as they can suffer if your salt levels are low. A good level of salt with mollies is 1 teaspoons of aquarium salt for every 2 gallons of water in your tank.

They like a diet of small pellets, granular foods, and flake. Also a treat of freeze dried, frozen or live foods is good for them.