A Betta in a 3 gallon that is heated to the right temperature would be very active. I have one in a 6 gallon and he swims around constantly. He's very pretty to watch. You'll be surprised at the change you will see from that half dead looking fish in the store.
You absolutely cannot put goldfish in this tank. Your options are very limited and have been listed a couple times. They are good options though.
I would go with a female Betta and 2-4 shrimp (depending on size). That'll look really good.
You absolutely cannot put goldfish in this tank. Your options are very limited and have been listed a couple times. They are good options though.
I would go with a female Betta and 2-4 shrimp (depending on size). That'll look really good.