I don't think they would hurt it. Although my lion hasn't shown any aggression towards other fish I have seen it show defense. I had a puffer recently, which turned out to be quite aggressive, and I saw it go towards the lion but the lion immediately pointed his back spines towards the puffer and waived them around. The puffer quickly backed off and I never saw it go near the lion again. I don't think it's an aggressive fish but it can certainly defend itself. I would just sneak it in at night when it will be most comfortable.
The most important thing to consider is training the new fish on frozen. It would be best to train it to eat frozen outside of your display in its own tank since any other competitors will make this much more difficult. You usually need to feed live food for a while first before it will take frozen. I'm fortunate enough to have Colby at Bayside who takes the time to train these kinds of fish before I purchase them.
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