Won't Miss #117 - algae tank

During the entire duration of my stay in Japan, there has been a little shop that has a fish tank out front. Sometimes, they clean the tank and you can see the goldfish living in it. Most of the time, it's in various states of being consumed by algae. I don't know much about fish, but I have read that algae kills them. It simply makes me sad seeing the fish being taken care of improperly, and I