If you are refering to Arowana...
I have my butcher trim all the white parts of the Beef Heart out and double grind it. I freeze it in a thin patty and shave it into coils at feeding time...That and Hikari pelletts
meal worms market prawns and crickets...
Hikari floating carnivore sticks, crickets, fish fillet, shrimp, bloodworms.......... there are more but this is all I can think of off the top of my head