I have a 200 gallon tank (7-2-2) and currently have a silver arowana, place, tsn, Florida gar, Oscar, two red belly pacu, and a clown knife. Most of these fish will eventually be moving into a large pond once they outgrow this tank so don't worry about that. I'm wanting to add a large exotic looking bottom dwelling fish that will not outgrow the tank (so stays at around 2'), can co-exist with these fish, is commonly available, and doesn't cost a fortune (below $40). What are my options?