Assuming you mean the African Jewel cichlid, pass on that one. Though beautiful adults are often outright nasty killing anything else in the tank, often including their mate. A friend had one alone in a 29, after it devastated his 55. They're are a nice specimen if you don't mind dedicating a tank to it.
Below is the first relevent link I could find.
http://www.timstropicals.com/Inventory/African/JewelInfo.asp
Below is the first relevent link I could find.
http://www.timstropicals.com/Inventory/African/JewelInfo.asp