when i feed during a shed, i percent the tank, since they usually are a little bit blind during a shed. sent and heat are the two main factors that will get them to go. this will usually always work, presenting that is. another trick is to dip it in almost boiling water then give it a dangle about 4-6 inches in front of your BP they usually take it every time. I only feed frozen when my guy is shedding just because he doesn't seem to be as active as when he is not. other wise he prefers live and i find my self coaxing him by presenting and or the hot water trick each time i feed pre-killed.