Sheepshead Minnow/Sailfin Molly; quartet
This is a LIVE ANIMAL and is only available with overnight shipping.
Both of these Cyprinid fishes are able to tolerate a wider range of salinity (called euryhaline) and can be kept in low salinity environments, or completely freshwater. These make for excellent feeders in any type of aquarium, and can also be easily reared in a separate tank for continuous feeding to your tank-mates.
Fun Fact: Mollies proliferate so easily, they are actually a staple in genetics studies. These fish give live birth, and as many as 7 generations can be observed within a single year!