Get between 8 to 10", with huge mouths respectively. To house two of them, granted they are a pair, nothing less than a 55gal tank, with 75gal or bigger being better.
also they got another pike in the tank with it i can definatly tell its not a belly crawler id almost say its a juvi sveni idk im thinkin about buyin it to grow it out its like a inch and a half. definatly not gunna put it with my big boy but i got a 10g i can grow the lil baby in and start cycling my 29 incase its a dwarf cuz the coloration is different then my sveni its darker and doesnt have white by the spots just black spots so idk but its rib's (rays i think) look like my sveni's do how they look metallic at the right angle. plus hes only 12 bux