I've fed San Francisco Bay bloodworms for over a year with no problems. I prefer this brand because the worms are smaller and easier for small fish to eat and there are more worms per cube. Hikari, while an excellent brand, seems to have more water per cube.
EDIT: Not that this means anything, but so far all I've found about SFBB's freezing process and quality is hearsay, no solid scientific facts. Just throwing that out there.
Last edited by Sakura8; 04-03-2013 at 12:19 AM.