If you're serious about the anemone, +1 for the metal halides (or a similar very powerful lighting). When you say puffer, do you mean an actual pufferfish? Or would you be content with a Toby, like a Saddleback or a blue spotted toby? Or a pufferfish that looks like the stereotypical pufferfish like the porcupine or dog face? I think (not sure), that you could get away with an anemone as long as the clowns were protective of it, i.e. they chased away fish trying to attack it. I say this because my valentini nips. If not a puffer, then how about a comet? Oh, and any puffer, toby or stereotypical, will get at the hermit crabs like an oscar in a guppy tank.