I have had various dwarf angels in reef set ups, because they are really good looking species, so it has been worth taking the risk for me
my experiences have been mixed
I had a model coral beauty, that never touched any corals
yet in a set up some time later, the coral beauty I added, seemed to sample everything
I had a potter angel in s softy dominated reef that was a model citizen
flame angel - tried a couple, no luck for me
Steve