There are some species that are more difficult than others. Bartlett's are supposed to be fairly easy. They all need to be fed several times a day, from what I've read and been told by other reefers. They can be kept singly if you don't want to keep a harem. If you would like to keep a harem ( one male to 7 or 8 females) only in your tank with no other fish, I think you probably have enough space.
I've witnessed Bartlett's feeding on
pellet food - New Life Spectrum - and their colors were amazing!