I saw an adult kafue pike (around 2 yrs of age), is it worth buying and keep.. Because in many websites i read, it said this fish will only live for 4-5 years in the wild. Will it be able to live longer in captivity? From what I know, the fish was captive raise since it was a baby...Will a 90 Gallon will be enough (currently its around 40cm long)? Cause their max size is around 70cm and i dont think they grow into that.. 