My first fish were 8 goldfish in a 10 gallon aquarium that all grew to 6 inches. After all but 2 died, (Keep in mind that this was when I was 10, or close to that anyway) I released them into a pond. My first tropical fish were 2 guppies, 2 cory catfish, 2 neon tetras, and one invasive snail that is all over petstores' windows; these were all in a 1 gallon. I kept wondering why the fish were dying every 2-3 weeks so I bought more every time. This was also when I was very little, and my parents thought I was old enough to take care of an aquarium MYSELF!