I think you could definitely have more than one, but your list is nuts. Maybe the sizes of these, one or two for the top/ middle and a couple for the bottom500 Gallons one fish I wasn't expecting that! Keep in mind the tank is 3 feet high I do feel that that makes a difference what you can add to the tank. Stingrays and arowana for example will be no where near each other. I tried to break it up into fish by sections or regions they would swim in.
