Bearded Dragon cage size?

[zarapie]

I have a tank left over from when I housed hamsters and I've always wanted a beardie. The length is 64 inches and the width is 16 inches. Would this be ok for a cage? Is it large enough?

 

[CooperDragon]

The length is great, but it's a bit narrow. An adult dragon is around 18-20'' long so I recommend having a tank at least 2 feet wide to make it easy for them to turn around in. 4'x2'x2' is a good minimum size but the more space you can provide, the better.