Performing Water Changes in the Fish Tank

Your Fish Tank requires periodic Water Changes.   The fish excrement and leftover food contaminate the water leading to the generation of nitrates.  This turns the water acidic and can be injurious to the health of the fish even killing them.

Some people mistakenly believe that a good filtration system is sufficient to maintain water quality.  No filtration system can be a substitute for periodic water changes.

Hence, maintaining water quality is of paramount importance.  It is not necessary to change all the water in the tank.  In fact, doing so change lead to fluctuations in temperature and water properties like pH.

Hence, it is ideal to make partial water changes.

Regular water changes are necessary. Change 10% of the water every week.  The water should be replaced with dechlorinated water.


Change 25% of the water in the tank every month.


Doing a water change is easy.  Just get a siphon available at any hardware store.


Get a bucket and place it near the aquarium.


Start the flow of water through the siphon by squeezing the bellow in the siphon.  Once the water starts flowing, the flow will continue.

Move the suction point of the siphon inside the tank and so that dirt at the bottom of the tank are sucked out.

In addition to water changes, the water parameters like pH, nitrate content should be measured periodically and recorded.

Once the water has been removed. Let the water settle down for a about 10 minutes


Getting the New water ready

The new water should be free of chlorine.

Check the pH of the water.

The new water to be added should at the same temperature as that in the water.

Add the water to the tank in small amounts, with a small bowl so as not to agitate the tank.  This can make the water cloudy.