Are these worms safe?

[Goaway]

Okay so like add a little bit of frozen shrimp?

No. Don't do this. If you don't want them, get that rock out of the tank ASAP before they migrate to the rest.

It's up to the OP. Feed them to keep die off from happening. Or let them die from hunger

 

[DocRose]

It's up to the OP. Feed them to keep die off from happening. Or let them die from hunger

Right, that's why I said, "If you don't want them,..."