How often should I change my fish tank filter? Is it prudent to adhere to a specific timeline, or does the variety of fish and type of tank necessitate a more nuanced approach? Considering the intricate balance of aquatic ecosystems, what factors should one take into account when determining the ideal frequency for filter replacement? Could the size of the tank, the quantity of fish, or the presence of live plants play a pivotal role in this decision-making process? Furthermore, how significantly does the quality of the filter itself influence its longevity and effectiveness? Is there a difference in approach for different types of filtration systems, such as mechanical, chemical, or biological? Should one be vigilant for signs of decreased performance, such as cloudy water or increased waste accumulation, as indicators for a necessary change? Overall, what best practices can enhance the longevity of the filter while ensuring a pristine environment for the aquatic inhabitants?