Maybe eating Goldfish would turn me into gold? My wife would say I finally made something of myself and trade me in for cold cash. I'd be worth what Ovommit gayve away to the Iranian islamists. $$$billions in untraceable cold cash.
Nah, that trend has passed and don't think anyone turned gold, but a few had some problems from doing it. Your wife might trade you in for 2 20 year olds. Lol..kidding.
Water from a fish tank alone won't hurt you unless you're growing poisonous plants. Taking pills or drinking something made for cleaning is like eating Tide pods.
My son had a salt water tank and he cleaned it. He put his hand in it to move something. Something he had in there swam by and touched his hand. It knocked him for a loop, but I'm pretty sure he'd never drink the water in it.