psps hI, Those people who love to feed gold fish to other critters they wouldn't be my first choice as feeder's oddly enough goldfish store toxic waste in their scales and have been known to cause liver cancer in some snakes ( garter's) just thought I would mention that on behaf of gold fish. . Doug ps goldifsh can cause a thamin deficincy that can cause nerological problems.(( But the big worry is an enzyme called thiaminase, which destroys vitamin B1 (thiamin) and causes thiamin deficiencies: if you feed your garter nothing but fish that contain thiaminase, this can kill your snake.)) oddly enough most saltwater fish lack thiaminase.