So just soak them in some tank water and they will sink right away? Dojo doesn't go to the surface.
Yea that's what I do, don't have many worms that float (or last very long if they do) the majority sink pretty quick, when I feed frozen food I mix several different types together and pour them all in at once so the bottom feeders and timid fish get a chance at em before the horde scoffs the lot.