Many fish-keepers feed their fish once or twice a day. You don't want to overfeed them because leftover food can clog your filter and create harmful toxins. Most importantly, you should only feed your fish as much food as they can eat in 5 minutes or less. Overfeeding can cause various health issues, including fatty liver disease. Too much food can also stress the fish, making them more susceptible to infections.  Shopping for fish food has never been easy, thanks to the Instacart app's delivery selection. Now you can have tasty fish food delivered to you with the convenience you expect from Instacart.