How can I change my fish tank water without harming or killing my fish?

To change your fish tank water without harming your fish, follow these steps:

1. Use a siphon to remove about 25-30 of the water.
2. Use a water conditioner to treat the new water before adding it to the tank.
3. Make sure the new water is the same temperature as the tank water.
4. Avoid sudden changes in water parameters.
5. Monitor your fish for any signs of stress after the water change.