Mollies are fresh water fishes but also found in some coastal areas of its origin country. Wild mollies are greenish-silvery in colour however, lot of sub-species and variants have been developed in aquarium trade including black mollies, speckled molly, Liberty molly (silver blue with red dorsal), various Lyretail strains,  white molly, etc. They grow to a maximum size of around 12 cm, though females are larger (12cm) but males grow to around 7 cm.  They are quiet peaceful towards their own kinds and also guppies, swordtail and platies and hence can be put in a single aquarium. Mollies are not much particular about the water quality and can withstand quiet a large water quality variations. They are omnivorous and feeds on algae, small meaty items and readily accept commercial aquarium diets given to omnivore fishes. Males can be distinguished by having bright colouration and a sexual organ gonopodium. They are ovoviparous and give birth to young ones.