"I'd been an athlete all my life, so I've always had calluses on my feet. This was the first time somebody got rid of my calluses completely," she said.First time customer KaNin Reese, 32, of Washington, described the tingling sensation created by the toothless fish: "It kind of feels like your foot's asleep," she said.The fish don't do the job alone. After 15 to 30 minutes in the tank, customers get a standard pedicure, made easier by the soft skin the doctor fish leave behind.Ho believes his is the only salon in the country to offer the treatment, which costs $35 for 15 minutes and $50 for 30 minutes. The spa has more than 1,000 fish, with about 100 in each individual pedicure tank at any given time.Dennis Arnold, a podiatrist who four years ago established the International Pedicure Association, said he had never heard of the treatment and doubts it will become widespread."I think most people would be afraid of it," he said.Customer Patsy Fisher, 42, of Crofton, Md., admitted she was nervous as she prepared for her first fish pedicure. But her apprehension dissolved into laughter after she put her feet in the tank and the fish swarmed to her toes."It's a little ticklish, actually," she said.Ho said the hot water in which the fish thrive doesn't support much plant or aquatic life, so they learned to feed on whatever food sources were available -- including dead, flaking skin. They leave live skin alone because, without teeth, they can't bite it off.