My fish seem to love and devour frozen bloodworms, and live baby brine shrimp... I thought they might not be very popular because they are so tiny, and my fish are getting fairly big, but sure enough, every time I put the live ones in , they swarm happily and pig out. They also devour the algae thins sinking food before the bottom fish can even get a nibble..
I would say mostly give the flakes, with worms and shrimp maybe twice a week or so for a snack.. hatching the shrimp is pretty easy, and they seem to love them... research says that the baby brine shrimp are only good for them within the first 24hrs of life while they still have a yolk sac attached, but many people feed them frozen brine shrimp which are larger, so you could try that as well...
Good luck.