Molly Fish: Care, Diet, Types, and Lifespan of Mollies. The molly fish is a freshwater fish of the Poeciliidae family.. There are several types of molly fish, including black molly fish, sailfin molly fish, Dalmatian molly fish, balloon molly fish, and lyretail molly fish.. Mollies come in a range of colors, including black, white, silver, red, and orange.. Due to their ability to adapt to almost any environment, molly fish are popular amongst beginner aquarists..
