That's the question. I just added one to my tank and want to make sure he (she) eats. I have been feeding my Clarki Clown Blood worms and Prime Reef, the Flame doesn't seem interested in these.
Also what to feed a Six Line Wrasse?
my coral beauty likes spiralina flakes,
it took a while for him to like mysis- but he enjoys it now
otherwise he just eats the algea all day long of anything and everything in the tank
I use Mysis, Algae sheets, and Formula 1(she loves this). I like to keep a variety of food for my fish. Also if you have problems feeding it soak it in garlic juice, they love that.