A betta fish tank needs regular cleaning to maintain the fish's health. Avoid going too long without cleaning the tank, as it can lead to poor water quality. The optimal frequency for cleaning a betta fish tank is every one to two weeks. This timeframe ensures that waste and debris are removed, preventing harmful bacteria and ammonia from accumulating. Cleaning the tank involves partial water changes, removing any uneaten food or waste, and scrubbing the tank walls to remove algae buildup. Maintaining a clean tank is crucial for your betta fish's overall well-being.