Copperband Butterfly: questions before I get one

[trilinearmipmap]

I am considering a Copperband Butterfly for my 120g mixed reef.

I have read that (A) they are delicate and (B) they may gobble up zoanthids, soft corals, clams etc. On the other hand I have heard of some Copperbands that leave corals mostly alone.

Corals in the tank include many LPS including bubble, octobubble, frogspawn, torch, trumpet, sun coral, also starting a few SPS, also softies including colt, ricordia, xenia, mushrooms, GSP, YSP, clove polyps, zoanthids etc. Also a nice RBTA, and two feather duster tube worms. In addition I want to get a Derasa clam soon.

Fish include Yellow Tang, Hippo Tang, two ocellaris clowns, spotted mandarin, and a Royal Gramma. There are also two Coral Banded Shrimp, and various snails and hitchiker crabs.

So the questions are:

(1) How many people have kept a CBB for more than 2 years?

(2) Besides the feather duster worms (I know I have to remove them first), which of my other corals etc will be safe with a CBB, and which will most likely be eaten?

IMO the CBB is the most beautiful fish there is, however I will not get one if it will destroy the rest of the tank, particularly the RBTA.