I have had a porcupine and a volitin at the same time. The lion doesn't care about the porcupine at all. The only time things got interesting was feeding time. As long as you can keep them apart, they will probably be fine. Had a niger trigger at the same time as those, he is the one that nipped the lion.
Whatever lion you get, be careful. If the other fish aren't at least twice as big as his mouth, it's just an expensive meal.