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Goldfish will also enjoy eating  krill, brine shrimp, bloodworms, tubifex worms, mosquito larvae,  and daphnia.     If you have a fishpond and quite a few large goldfish, try cat  food. Just buy a brand that has a spherical pellet so that it is  easier for the fish to swallow.
You can buy low sodium canned tuna and if you're just giving the water I don't think that's a problem or even a teaspoon of the tuna itself but you shouldn't do it every day because cats can become very addicted to the smell of tuna and this can lead to finicky eating habits and tuna does have mercury.