I worked at a store that got these quite frequently.. what i did was mix live blackworms, frozen bloodworms, mysis,bits of krill,brine(frozen), live brine, along with flake..i think a frozen food i used also was mega marine which has blackworms, krill, urchin, squid.. they liked all of the food i gave them.. they really attacked the live blackwoms.. i mixed all of these because i know they probably hadnt eaten in awhile through shipping and holiding everywhere they had been.. within a few days of this had them eating anything i offered whether it be the live, frozen only, or flake..