How often should I change my fish tank filter to maintain a healthy aquatic environment for my fish? Is there a specific timeframe that is generally recommended, or does it vary based on the type of filter I am using? For instance, do factors such as the size of the tank, the number of fish, and the presence of plants or decorations influence the frequency with which I should replace or clean the filter? Furthermore, is it essential to consider the water quality and clarity, as subtle changes may indicate that the filter is losing its efficacy? Also, could the type of fish being kept in the tank play a role in determining the optimal schedule for filter changes? Should I adhere to a strict maintenance routine, or are there signs to watch out for that signal when it is time to act? What best practices should I follow to ensure my fish remain healthy and happy?