Moly fish (Poecilia sphenops) are freshwater fish in the Poeciliidae family. They are native to Central and South America, living in freshwater, brackish, and sea waters. Their hardy nature and ease of care make them popular among hobbyists.
Like their cousins, the platy, swordtail, and guppies, mollies are livebearers; they give birth to live young ones instead of laying eggs. Due to their high growth rate, and quick reproduction, they are commonly bred as feeder fish.
Molly fish can thrive in a range of water conditions. They prefer a pH range of 7.0-8.5. and temperature between 72-82°F. An aquarium heater is necessary to keep the water steadily warm when cold sets in.
Mollies are omnivorous and will eat various foods, including algae, small insects, and commercial fish food. Their diet should contain plenty of vegetables and proteins. Under the right care, molies can grow 3 to 6 inches long and live up to 5 years.
Since they are schooling fish, it’s recommended that you keep them in groups of at least 3-5 individuals. However, keep only one molly fish per 5-gallon tank. You may also keep them with other peaceful tankmates like tetras, guppies, and platies.