I have had my betta fish, Figaro, for a year and a half. To the best of my knowledge he has been happy and active for all that time. I kept him in a regular fish bowl with no filtration or heating system, with a floating plant, a stable plant, a "cave", and marbles on the bottom. We feed him every morning with pellets and wash his tank once a week.
I recently moved to college which caused Figaro to have to be moved into a new home, about half a gallon smaller, but with the same decorations and food. Figaro just seems sad. He frequents the top of the bowl, just lying there until I feed him.
Is he just getting used to his new environment? Is he dying because I put too much stress on him? Please help, he is my best friend, sadly enough.