Cooked and frozen. I take out two or 3 of them to defrost and then I cut them into pieces of different sizes. The two big clowns can eat the big ones but the smaller clowns and the barbs need smaller pieces.
I feed the tank Repashy for the clowns, frozen mysis and brine shrimp for all, flake for the barbs but the clowns eat anything. I have an assortment of Ebo Aquaristik foods (shrimp and mussel sticks, veggie sticks I feed for the clowns as well as my custom mix of kensfiish bigger sinking sticks. I also have freeze dried daphnia which the barbs eat as it floats for a while.
The cooked shrimp I have been feeding maybe once a week or so.
As I have written or said many time, all my fish are pigs, They will eat or try to eat anything they think might be food. The problem in the tank is when I started the fish off years ago I made the mistake of using the bigger size river gravel, It is rounded but it's size means food can slip down below the surface easily. The clowns know how to dig in this, they pick up a stone and toss it aside and then do it again until they get down to whatever piece of food is there. Sometime I hear stobes tossed against the glass.
This piggish tendency seems to be in any fish I keep. I am not sure, but I think some of my fish actually continue to eat for a while after they have died.....