OP, you need to read this thread:
http://www.monsterfishkeepers.com/f...-and-ID-of-Payaras-(Cynodontidae-et-al-)-1-01
It'll give you the basics as written by members of MFK who have actually experienced keeping these monsters. You'll need to upgrade to at least a 75/90 gallon tank in order to get even one of the smallest species of payara.
http://www.monsterfishkeepers.com/f...-and-ID-of-Payaras-(Cynodontidae-et-al-)-1-01
It'll give you the basics as written by members of MFK who have actually experienced keeping these monsters. You'll need to upgrade to at least a 75/90 gallon tank in order to get even one of the smallest species of payara.