"*xVx*" wrote in message ...

could it be "bad frozen bloodworms" or has anyone had any similar
experiences?

Yeah, it's possible. You're lucky you fed them to hard-as-nails fish
like barbs - I killed a tankful of more sensitive fish with
bloodworms. Within just a few days they developed dropsy (intestinal
bacterial infections) and died.

It's much harder to tell when bloodworms are off than when, say, white
or black mosquito larvae are. Plus bloodworms are strongly allergenic
to humans.

I simply don't feed it anymore. Not worth the risk.