I read a bit and you need a special permit from the Department of Fish and Game to take or hold them in CA
. Places like Aquarium of the Pacific have one. I'm guessing they won't give permits to the average aquarist.
They are very territorial and aggressive, so even if a site somewhere says they are okay in a smaller tank, I would assume that is as a juvenile and probably without other fish. They end up being extra large damsels with extra large attitudes and hyper-territorial. The adults will attack divers, so I'm not sure I'd put them with any fish. If you have ever snorkeled/dived around these guys, you would probably have a good idea of why they are better left in the wild.