I converted them all by accident. MY live feeders all took F/T one day. I think it ws because i changed my heating method from water to a heat pad. I just stick them things on in their bags on top of a human heating pad and set it to 1 or 2 and let them thaw out for a couple hours, and then feed them off when theyre nice and warm to the touch. They dont cool down as fast as the water thawed ones do in my experience, and it helps if you have to dance them any longer than usual.