Wag tail platies (Xiphophorus sp.) are a species of freshwater fish in the family Poeciliidae. They are native to Central America and can be found in rivers, streams, and lakes. Wag tail platies are small fish, typically only growing to be 2-3 inches long. They have a laterally compressed body shape and their name comes from their distinctive wagging tail fin. Wagtail platies are omnivorous and will eat a variety of foods including algae, insects, and small crustaceans.
Wagtail platies are popular aquarium fish because they are relatively easy to care for and their bright colors add interest to an aquarium. They prefer water that is neutral to slightly alkaline with a temperature range of 72-82 degrees Fahrenheit. In the wild, wagtail platies live in shoals so it is best to keep them in groups of 3 or more in an aquarium. If kept alone they may become stressed which can lead to health problems. Aquariums should be at least 10 gallons for a group of 3 wagtail platies and larger if more fish are added. These fish also do well in planted tanks as they help control algae growth.
Wagtail platies are livebearers which means they give birth to live young rather than laying eggs like most other fish species. Females will often drop their fry (baby fish) into hiding spots around the tank where they can safely grow until they reach adulthood. This behavior can make it difficult for hobbyists to successfully breed these fish but it also helps ensure that wild populations remain healthy as fry that would otherwise perish have a better chance of survival