Well,since my lionfish now recognizes me as it's feeder,it knows I'm going to feed it when I take out the little green net to give it a goldfish.Get the piece of dead fish and cut it out to around the size of the feeder fish your feeding it and use a needle to put a string through one end of the fish piece,hold the green net over the fish tank and he should come up if he knows your his feeder,now hold the fish piece by the string and let the lionfish have his mouth near the top of the water so he won't have time to know if it's a feeder fish or not by the time he eats it and drop the fish piece extremely near his mouth and he should eat it and now just pull the string out(If you use tongs or some other big thing he'll know it's not a live fish,I use string since he can't really see it that well).By the way,hold each end of the string between two fingers so you can let one end go and hold on to the other so you won't drop the string piece in the tank and so your lionfish won't eat the string also.