Keeping a lion with puffers and triggers is always a gray area; sometimes it works and sometimes it doesn't. They sure seem like a natural combination, don't they? But, IMO, a lion is not an aggressive fish, just a predator which usually won't bother anything it can't swallow whole..and they can swallow a much bigger fish (or invert) than you'd think. Often, their slow, flowing fins are a tempting target for triggers & puffers; but, it all depends on the individual fish. I defiantly would avoid keeping a lion with the real aggressive triggers; such as clowns and undulateds.