Getting back to bloodworms, many creatures that look like worms and are red are called Bloodworms. But the ones sold for tropical fish food are not real worms.
Blackworms are grown in California and are real worms that are commonly sold to pet shops. I use them every day.
http://search.aol.com/aol/image?q=bl...i1-standardaol
These are the blackworms I use in their keeper.