Cleaning Your Tank

Water should be changed at least once a month. Weekly is even better.
Many people make the mistake of taking all the water out of the tank and scrubbing everything. This is bad because it kills the good bacteria and stresses the fish.
You need to change 1/3 of the water in the tank.
Age some water: fill a container with enough tap water to change that much water
Let it sit for at least 1 day with the lid off (longer is better so that the chlorine evaporates out).
Use the siphon to pump out 1/3 of the water from the tank (tip: this water is great for plants).
Pour the aged water into the tank (tip: pour the water slowly into the filter. If you pour it directly into the tank it may stir up dirt and knock down decorations)