Cant really answer this without more information. Nitrate/nitrite/ammonia readings..actual reading please "fine" doesnt help us either. How often are you doing water changes and how much. When was the tank setup, what size is it, tank temp, tankmates. Feeding schedule and what kind of foods, I probably missed something but without that info it will be hard for anyone to give you help/opinions/advice.
Oh welcome to the tank.