They look big enough to eat whole reg. worms, and probably whole nightcrawlers im sure. Ghost shrimp won't do it. but the worms in! Ghost shrimp have no nutriential value. rinse the worm off and i would put 4-6 nightcrawlers in... prolly cut them in half so that the worms blood will excite them to eat em.... i wouldnt wait until tomorrow...try and get them eating the worm now