I was wondering if anything is wrong with my betta fish. He is in a 5 gallon eclipse aquarium with plenty of plants and coverage. The temperature is almost always 80 degrees without using a heater.

Anyway he keeps swimming quickly up and down the corners of the tank. I don't know if this is normal and hes just being curious but he seems to be swimming very wildly up and down the corners very quickly. I just don't want him to get hurt... Is this normal?