For hundreds of years, spas in Asia have used carp to eat the dead skin off their customers. It's supposedly relaxing and healthy. Tuyet Bui decided that the treatment might prove popular in her nail salon in Kent, Washington. And it did, with customers flocking to have carp nibble their feet. But after just a few weeks, state regulators told her to stop the practice. They say state law requires all equipment used in pedicures to be sanitized. Bui changed the water between treatments. "But there is just no way to sanitize live fish," said a spokesman for the Department of Licensing.