i dont think many know much about sharks/ salt water fish on here.
I would think a lionfish would be up there in aggression but i simply have no clue as my personal experience with them is seeing them at 1 local store and wondering if i want to put the work into switchin to salt and never do
For their size, male Kenyi are quite simply insane and never stop terrorizing other fish, even their own female counterparts lol, or maybe mine just has a severe attitude problem. Besides that, some native fish species, Pike and Bass lol there's actually a massive aquarium here stocked full of Huge Bass, Walleye, Gar, Perch and sunfish. http://www.youtube.com/watch?v=7eLs2d0t-DQ