he ate chunks of shrimp no prob when i had him. you can also try pieces of earthworm. feed him when you turn the lights off and he will be more willing to eat, bgk's are nocturnal.
I have one over a foot long eats silver sides, krill shrimp, small fish, worms you name it he eats it. As he has gotten older he has gotten lees picky. ps i forgot massivor delight.
mine likes tetra cichlid sticks,it comes to the top to get them,shrimp pellets.pieces of shrimp,worms it is almost 11 1/2 inches, i used to feed it beefheart but then i learned not to.
Just chucked a 2" section of cucumber in with my BGK - he's tunnelling through it at a steady rate. Not sure if he's enjoying eating or playing the most.