I have a question for experienced JD keepers. At the present I have a young JD juvenile that is already showing signs of being a pretty aggressive guy / gal. He shares a tank with a young red tail shark without any problems, (the RTS gets out of the way and he doesn't seem to mind it too much on the whole anyway,) but I tried having a synodontis in there with him and he just wanted to beat up on it. So, my question is are there other smaller fish like the Red Tail Shark who will work well with a JD? A two fish tank just seems very empty and depressing. Tank size is 70 gallons.