I have 5 barlett's in my 210 as well as a female purple square. At one time I had a pair of sunbursts in my 60 before it crashed.
I feed from a couple times every other day to once a day depending on time allowed. It's been my experience that 3 daily feedings are not necessary. I would highly suggest to only buy anthias that are already eating prepared food at your LFS
(usually small mysis or brine shrimp). When I first brought the fish home I fed twice a day religiously for about 2 weeks. After I noticed the fish getting plump and happy I started doing once a day, and they every other day. During this two week transition period, it seemed very helpful to incorporate micro foods into their feedings (cyclopeze - the loose variety, not the flakes, as well as reef chili from BRS). I was already using these micro foods to target feed corals and sponges, but found the anthias enjoying it as well.
Also, I would highly recommend to buy anthias in a small school. From my experience, they tended not to do as well solo. If you can, but all female/juvenile with one male. A harem of only females will do well as well. More than 1 male in all but larger tanks, always ended up in the death of the smaller male for me.
As for compatibility, they are considered reef-safe and will not bother other fish and other corals/inverts.
Hope this helps...