<human>:  What are the best practices to clean a fish tank? 7 .What is the best kind of soil to use when planting a vegetable garden?
<bot>: The best practices for cleaning a fish tank include replacing 25-50% of the water in the tank each week, checking and adjusting the pH levels of the water, vacuuming the gravel to remove debris, and scrubbing the tank walls with a mild cleanser. As for the best kind of soil to use when planting a vegetable garden, it is best to use a soil that is high in organic matter and well-draining, such as a soil-based potting mix. You should also add mulch and compost to improve the soil quality and provide essential nutrients.