They go by many names, including velvet cichlids, tiger Oscar, and marbled cichlids. Oscars are popular in aquariums ... minimum tank size for most Oscars is between 55 to 75 gallons.

Oscars grow up to 15 inches in length, so a 75-gallon tank is the bare minimum for one ... you'll have a giant aquarium for a decade or more. If you're into metallics, it's tough to top the ...