I have a 150 gallon tank with a male jd, 2 female texas and a female green terror. I also have a common pleco. The cichlids are between 2 and 3 inches and the pleco maybe 5-6 inches. I wanted to have an oddball in the tank and I was thinking about a polypterus. The problem is I really don't know anything about the different species of polypterus. I was wondering what species would be the best for that stocking and if you have other ideas then polys, I'm open minded