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I have Zoanthids in my tank and my CBB doesn't touch them. He could be the exception to all of the rules! :razz:

Not true times two (so far, IME).

So then, what will they eat in a reef tank?

Many will pick at open brain corals and clams. They'll also eat a lot of the smaller worms from the sand, at least mine did.

Copperband butterflies are not universally reef safe. Do a search on RC and you will find plenty of bad experiences, although some have no problems.

Heniochus diphreutes (sp?) is supposed to be the best of the bannerfish for reefs, but a bit hard to find. I have 2 H. accuminata and they did pick an open brain to death, and nip at clams once in a while. I may kidnap them one day and trade them in.

Royal Gramma is a beautiful and peaceful fish, reef safe. Also check out Watanabei angelfish - one of the few reef safe angels - males are spectacular.

Lawnmower goby is hard not to like.

Powder brown tang is something else to consider. (japonicus, not nigricans)

How would the powder brown tang coexist with my yellow tang? How would the powder brown do with a hippo tang?

I think the powder brown would be fine with a yellow. Not sure about the blue. A blue and a yellow get along fine (that's what I have - kind of wish I got a powder brown instead - the blue is pretty but flaky - not unlike in Nemo)