Im going to get monster tank of at least 400 gallons, and it will be stocked with fish like arrows, gars, large cats, rays, etc, and I want to include knifefish. I am trying to keep the tank strictly American, and so these are my current choices: Buffalo knife, Carapo Knife, Black ghost Knife, And if I can get my hands on an anaconda knife or e eel. Whats ure opinion. Also, im temted by cks but they aren't from the Americas (except in florida). Thanks.