I saw some packets of live blood worms in my local pet shop and was thinking
of getting some for my 3 goldfish.

The worms were in (presumably) blood (well the liquid was very red anyway!),
does it matter if any of this blood gets in to the tank?

Basically I'm not sure what to do with the worms once I have them, and any
advice would be appreciated, i.e. do I feed them live, what portions etc.

They also had live brine shrimp, which would be best?

Thanks

Andrew