I meant, near the north, near Baltimore, or near the mouth of the Susquehanna? Farther south, such as near Chesapeake Beach? Closer to Solomon'a Island? Maybe as far south as Ridge or Point Lookout? Or are you on the Eastern Shore? The live food that you can catch will differ.
try getting hold of some mysid shrimps. They're smaller and he may munch on them, also if you have live rock, there may be amphipods in it he's eating.
Now please excuse an iggerant Kiwi, but by crayfish, do you mean a freshwater crustacean (in NZ a crayfish is a marine spiny rock lobster!) if so you need to feed more marine content as they don't have enough nutritional value for him. You might be able to get marine feeder shrimps?