Thanks Deathcurl. I guess I will just try it out. The sevs are still pretty small and the jack is so small right now that it might end up as food for the rays if I am not careful. If it works it works I guess and if not I will just have to move the rays to another tank.
The best word of advice is to watch the situation. I have a friend that has a tank full of different aggressive cichlid species that are known to kill anything that's housed with them. Somehow, they all peacefully coexist. There are always exceptions to the rule, but I'd hate to see you learn the hard way and lose fish. Sometimes it's better to be safe than sorry. Good luck and feel free to ask for advice .