The fish only like to consume affected (dead) skin cells. In Turkey where they originated, it was discovered they had quite unique dietary habits. Locals found that the fish would peck away at the dead and diseased skin of bathers, easing the symptoms of those suffering from skin conditions such as psoriasis. The high temperature of the water makes it difficult for most other nutrients to survive, turning the fish into voracious diners which attack just about any foreign object that enters their domain, and if the going gets really tough, they can eat each other.
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