I have spent way more than necessary on food for my tropical fish.
I went on buying spree when I first started because I heard it was necessary to have "a variety of food" in order to have a more balanced diet for the fish. Most people would just have one single type of fish food. As you can see from the list, I have bought too many. Some of them were ordered more than one package due to the discount and shipping fee concern. It's probably over $150 in total just to feed some tiny fish lol. On the bright side, they don't eat much. What I bought could last a very long time when stored properly in the fridge and freezer.