Draining a fish tank is an essential part of fishkeeping. It allows you to remove waste, uneaten food, and other debris from the tank, which can help to keep your fish healthy and happy. Draining the tank also allows you to clean the gravel or substrate and the filter, which can help to prevent the buildup of harmful bacteria.
There are many different ways to drain a fish tank, but the most common method is to use a siphon. A siphon is a tube that is used to create a vacuum, which draws water out of the tank. To use a siphon, simply place one end of the tube in the tank and the other end in a bucket or other container. The water will begin to flow out of the tank and into the bucket. You can adjust the flow of water by raising or lowering the end of the tube in the tank.