Live blood worms are a great food, but keep in mind that they are 90% water, so their nutrition content by volume is only about 10% of an equal volume of dry food. this is true for pretty much all commonly used live foods. Frozen bllod worms tend to have a fair amount of crap frozen with them so I rinse them first. They don't look as appealing as the live ones. Apparently, Britain has people who collect and sell live ones.