I have a tank with no main fish. It has one large goldfish (was to be food years ago, ugh) one large standard pleco, 4 tiny long fin plecos and a zebra loach. I am looking for some neat fish ideas that can be added into this misfit tank. Not wanting something that is aggressive or will want to be a solitaire fish. My tank is a 65 gallon square. Would like maybe small to medium, and maybe colorful.