Keep trying. They will begin to eat regular garden worms soon. Stevie turned her nose up at a few different kinds of worms at the beginning, now she eats every worm that hits the water.
Try buying your worms on line. I get mine from earth worms for sale.com, or uncle Jim's worm farm. Incidentally I think both of those are the same business.
Personally, I don't think feeding a diet of only shrimp is good for any fish. I also question the chemicals that could possibly be in these shrimp as they are generally farm raised in monster ponds in southeast Asia.
Depending on the quantity I buy my worms for between $.05-$.06 her one. But they are multiplying in the garden so and I have my friends bringing them so it's almost free now
