I am glad to see you opted out of getting a jewel. I just started reading this today and it was sounding a little like my tank lol. I have a Green Sev, Gold Sev, and a Jewel cichlid. While i would trust a jewel with the severums, I wouldn't have trusted one with the rest of your stock list. She would easily kill tetras and not even blink while doing it. I personally would get a few juvenile sevs and see if they pair up. They seem more active when they have a buddy.