I've kept copper sweepers, but never goldens. I am going to set up a display where the tank is like the mouth of a cave and have the sweepers in a school just like I've seen in the ocean.
In the past I've kept them they do not ship well, even from ocean to my tanks when I've caught them myself and gone streight home. The ones that make it to a couple of days seem to do well, but they are very docile, being picked on by just about any other fish. They are sensative to stress, and I kept losing them to stress related problems. At one point I was left with 3 in a lg reef and they did fine, but it took 20 or so on several tries to get the 3. In my next set up, they will be the only fish (at least until they are very well established). I think, just from the past tries, they will do ok if they have no stress, then I'll add some other peaceful fish that share the habitat.