I had a bicolour, and found it reasonably hardy though it got shifted when I decided I wanted a pair. I don't think they're easy long term, and def appreciate some hair algae and stuff to browse on, but they are awesome, awesome fish. Having a pair (2 weeks now) is so cool, and the larger is def now turning into a male as the dorsal and anal fins are stretching.
I have no real tips, except look at photos of where they live, try to build a tank that looks like that if you want to keep the tougher species. And buy them small and care for them. I think you have to assume they will get at least 50% of their nutrition browsing, and prepred foods are just a supplement, so I wonder if really nutrient bare sps tanks would be a bit too low on nutrient?
Next year I move into my new house, and am so going to work for a spawn when I get a deep enough tank. There are a stack of commercial fish farmers round here working on pelagic species, and so I have discovered some sources of rotifers and other standard foods that i can get for effectively zero, so having a real go at growing some out is now slightly less impossible (though obviously no cakewalk). The fish farmers are definitely interested in helping out.