My new plan is to get an Oscar, a severum, a common plecostomus, and MAYBE another cichlid (5-10in.) I used aqadvisor, which I know isn't totally accurate but still gives you an idea,NAND it told me an Oscar, severum, and pleco would be too big for my 150g tank and my Rena xo3 (175g) would only be satisfactory (not plenty.) If it is true then it is true, maybe I'll go with a smaller pleco, but I wanted to ask you all first!