The answer to the question about who accidentally fed the fish too much food is letter A or Evan N. There are too many reasons why it is not good to feed your fish with too much feed and some of these reasons are as follows: 1) Fatty liver or hepatic lipidosis which affects the function of their liver and can cause death, and 2) Improper digestion which happens when fish get too much food that they can normally take each day.
Aside from these reasons, there are several factors which happens when you give too much food for your fish such as low oxygen level which happens when uneaten food and fish waste decay, algae bloom which happens when there are too many uneaten food present in an aquarium and flatworms which appears when the quality of water is not good due to uneaten food.