One other important thing to remember about African Butterfly fish is they do not like current. And the jewel cichlid you mentioned is a very aggressive cichlid (from my experience) so if you decide to try just watch out for it. In fishkeeping, there usually are no absolutes. What works in my tank may not work in yours and vice versa. You can always try it out but it would be a good idea to have a back up plan in case things don't work out. Good luck to you and let us know how it turns out.