i have, it obviously one of the PACU species, google search pacu info or soemthing, or image search pacu, i am sure you will find it is a certain type of pacu, they come from brasil and in general south america, some species get HUGE, they are closely related to pirahna's but lack the teeth and the nasty dispostion, they are generally compatable but grow very big, and will eat most things that will fit in their mouth.
hope that helps.
kubora666