I have never heard of a fish that didn't like any form of bloodworms. Just be careful on what type of fish you are talking about. If it's goldfish for example, they are mostly plant eaters, and blood worms would be too much protien if fed to them more than say once a week.
for real? I had some Zebra Danio's and they werent interested in the frozen blood worms but i've got 4 glowlight tetra's and 2 kuhli(coolie) Loach's, i'm not sure if I drop a cube in the tank if it would be too much for them or should I cut a cube into quaters? I just had that idea then lol.
i'm getting some more fish today so hopefuly they will be able to help with the frozen bloodworm fest!