Hello! I bought a Fancy Fantail goldfish just to keep as a pet, and he has been alive for almost a year! The thing is, when I got him, I did not realize that goldfish needed very large tanks in order to be happy and live a long time. With that being said, he has been in a small, one gallon bowl for his year of life. Needless to say, I feel awful about it and I feel that it is only right to get him a larger tank for his one year fish birthday. However, I do not have room for a 30 gallon tank anywhere in my house, and I know next to nothing about tanks and filtering. I'm also worried that the change in the environment will kill my fish. Does anybody have any recommendations for smaller tanks that could be suitable for my fish, or even tips that a beginner goldfish owner should know? I love my fish dearly and I don't want him to die because I'm inexperienced.