Red oscars are the second most common ... Males usually stand guard to make sure other fish don't gobble them up. If you do hope to breed your oscars, pick up a sponge filter instead of a regular ...

The red shading fades into dark fins, and their black eyes are rimmed in orange. Oscars, like most fish, are timid when they're first introduced to a new aquarium. After they've had a few days to ...