How to do a water change in a fish tank?

To do a water change in a fish tank, first, prepare new water that is the same temperature and treated with a water conditioner. Use a siphon to remove about 25-50 of the tank water, being careful not to disturb the gravel or decorations too much. Pour in the new water slowly to avoid stressing the fish. Repeat this process regularly to maintain a healthy environment for your fish.