How To Add Water To Fish Tank

While adding water to a fish tank may sound like it would be a pretty straightforward process, there are certain steps to follow to ensure that you do this task properly. If you have just purchased a new fish tank, you will need to purchase the necessary items to do this job properly. This includes an aquarium water conditioner, a clean bucket (which you should then only use for tank cleaning purposes), and a clean plate.

These are all of the products that you will need in order to fill your new tank with water. Before you start the process, you should clean the new tank. However, only use tap water to clean the tank and never use chemical products or soap to do this, as this could be hazardous to your fish.

Summary of what you need to purchase

The products you will need to have or buy in order to safely fill your new fish tank with water include:

  • Water conditioner for use in fish tanks.
  • A clean bucket. If you already have a bucket, you can clean it with bleach, rinse thoroughly, and allow to air dry.
  • A clean plate. Again, you can use an existing plate as long as you soak it in bleach for ten minutes, rinse it thoroughly with water, and then allow it to air dry.

Below is a video reference about how to purify tap water for your aquarium:

Adding the water: a step-by-step process

This simple step by step process should help to ensure you add water to your new fish tank without any issues.

  • First off, you need to add the gravel. In order to do this, add three inches of washed gravel. You then need to place a plate on top of the gravel once it has been added. It is important to ensure that the plate is completely clean without any soap remnants or chemical residue on it.
  • Once the gravel and plate are in the tank, you are ready to start filling the tank. It is advisable to let the cold water tap for several minutes. This will ensure that any mineral residue is eliminated before you start filling your bucket.
  • Using your clean bucket, fill it to around two-thirds with cold water. Remember, the bucket must be completely clean without any soap or chemical residue.
  • When you have filled the bucket to the appropriate level, slowly pour it onto the plate that you placed on the gravel in the tank. You will need to refill the bucket once the water has gone. This is something you need to repeat until the tank is filled to around halfway with water.
  • When the tank is around half full, you can add any decorations and plants that you plan to have in the tank. You can also install the filter and heater but do not plug them in just yet. This is because you need to continue putting water in the tank until it is full.
  • Once you have placed your decorations, plants, the filter, and the heater, you can continue filling the tank. Simply continue using the bucket to pour water in until the tank is completely filled.
  • When the tank is filled, you can then reach in and remove the plate from the gravel. You can now take the opportunity to add the water conditioner that you purchased. It is vital that you read the directions on the package properly to ensure that you use it appropriately. This conditioner will help to neutralize the water to provide protection against chemical imbalance caused by chlorine or other chemicals.
  • You are now ready to get the water up to the right temperature. You can plus the filter and heater into the electrical outlet. However, let them run for a minimum of 24 hours before you add your fish to the tank.

So, that’s all there is to it. Once you have added water safely to your fish tank for the first time, it will soon become second nature. Just bear in mind the importance of avoiding soap and other chemicals and ensure that all items placed inside the tank – or used to fill it – are allowed to air dry. This eliminates the risk of contamination by chemicals that are found in everyday household products.


Filling your tank with water is a simple and straightforward process. As with anything else, once you have done it and got the hang of it, the process will not seem as daunting as it might at first.

Once your water is in, the tank has been running for at least 24 hours, and the water is at the right temperature, you will be able to add your fish. By following these steps you can enjoy the reassurance that the water in the tank is safe and healthy for your fish.