You should use a net daily to remove the larger particles that are floating around in the tank. Every couple of days or once a week, you should check the water’s pH level in the tank to ensure it is still habitable. The pH level should be at 7 or 8. Also, every week replace some of the water in the tank to maintain its level. The frequency of cleaning is also dependent on the type of filter you use. If it is a good one then you can manage to clean the tank once every 10 days.