When I first got my BGK it was eating blood worms really great. I fed this for about 2 months. So then I tried feeding it freeze dried tubifex worms and it wouldnt eat it. Later I tried Hikari sinking pellets and it ate it but not as fast as blood worms. I kept feeding nothing but the sinking pellets for a few weeks to get the BGK used to it. Each day it was eating it better and better. Now it gobbles it up fast. I then started experimenting more and gave it krill, brine shrimp and even market shrimp and it eats all of it.
Later I will try mealworms and see hw that goes. It ate a guppy once but it was more of an opportunity thing.