I bought my friend a 1 gallon tank for her birthday, to get her into fish. Well, she LOVES her little betta and the tank, so now she is thinking about upgrading.
What size do you think would be good for a beginner?
What size do you think would be good for a beginner?

The larger the tank is, the more stable the water parameters remain between water changes and you can put in more lovely fish and plants and bogwood and fish, oops getting carried away again