I am currently working on my 180 and trying to figure out a stocklist. I want a fish that is long and skinny for my centerpiece fish. I love aro's, clown knifes, and gars. The smallest fish out of the bunch seems to be a short nose but I still have no idea how big they get? Would they be fine in a 180 with either a few bichirs and two oscars or instead of the bichirs two retic rays?