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Regular water changes are an important part of freshwater aquarium care and maintenance. Partial change of tank water allows you to control levels of contaminants and toxins more closely. To do the water change, you need to have clean water ready and suck the dirty water out of the tank. You can also combine cleaning of the substrate and removing algae on the walls of the tank, then gently add clean water to the tank so as not to affect the fish and have a nice clean aquarium.
Steps
Preparing for a water change
- You should prepare two plastic buckets for aquarium use only. If necessary, you can write the word “fish” on the bucket for marking. [2] X Research Source
- Some people prefer to use tap water directly to change the water for the aquarium. This is more convenient, but it can expose the fish to harmful chemicals. To reduce this risk, turn on the faucet for about 5 minutes before flushing the bucket. [3] X Research Sources
- Changing the filter too often is not good for the aquarium, as beneficial bacteria will also be taken out of the tank. To balance, when replacing a new filter, you should invest in a layer of gravel or sand that already has beneficial bacteria spread on the bottom of the tank. [6] X Research Sources
- Do not wash plants and decorations with soap. Chemical residues can harm fish and cause algae to thrive.
- You can also soak plants and decorations in a solution of water and a dechlorinator. For each bucket of water, add 1-2 tablespoons of dechlorinator. [8] X Research Sources
Doug Ludemann
Professional aquarist
Doug Ludemann is the owner and operator of Fish Geek, LLC, a professional aquarium services company based in Minneappis. He has worked in the fisheries and fish care industry for over 20 years and received a Bachelor’s degree in Ecology, Evolution, and Behavior from the University of Minnesota. Doug has previously worked with the Minnesota Zoo and the Shedd Aquarium in Chicago as a professional aquarist.
Professional aquarist
You can add lanthanum chloride to your tank to remove phosphate, which causes algae to grow. Lanthanum chloride is a molecule that binds phosphate molecules into an insoluble compound. This compound will make the water cloudy and you will need to filter the water to remove them, or they will stay that way in the tank. However, if you can get rid of this compound, you will also be able to get rid of the phosphate.
Carry out a water change
- This method is especially useful for those who cannot carry water to clean the tank regularly and avoid causing the water to spill out.
- Make sure the new water you replace in the tank is the same temperature as the water in the tank. Check this before starting the automatic tank water change process. [11] X Research Source
- You don’t have to completely clean the substrate with every water change. In fact, it is better to divide the tank into different areas and only clean a certain area each time. This will limit the effect of the water change on the fish.
- For example, if the tank has a capacity of 40 L you should use a 12 L bucket to change the water. That way, when the bucket is full, you’ll know you’ve removed the required amount of water. [14] X Research Source
- Changes in water temperature can make fish more susceptible to disease. You will need to re-measure the water temperature after adding fresh water to the tank.
- Either way, make sure you don’t fill the tank with water too quickly to avoid disturbing the substrate and decorations. Many people often use their hands or a plate to reduce the force of the water flowing into the tank.
Keep the aquarium clean for a long time
- You need to balance the need to keep the tank clean with the health of the fish. Cleaning the aquarium too much or too little affects the health of the fish living in the tank.
Advice
- Many people find it helpful to keep an aquarium maintenance log to record the date, the amount of water changed, and the observations you find important. [24] X Research Source
- You can take advantage of the dirty water drawn from the aquarium to water the plants. [25] X Research Sources
- As you gain experience, you will be able to change the aquarium water faster and faster. If you get used to it, you can even regularly clean large aquariums in less than an hour. [26] X Research Sources
Warning
- If you have too many fish in your tank, you will need to clean the tank more often. [27] X Research Source
Things you need
- 2-3 plastic buckets (10 L each)
- Faucet head
- Automatic water changer (optional)
- Brush
- Dechlorination solution
- Fish tank suction pipe
- Filter cartridge or replacement tool
- Paper towels (optional)
- Chopsticks (optional)
- Water bottle or dish (optional)
This article is co-authored by a team of editors and trained researchers who confirm the accuracy and completeness of the article.
The wikiHow Content Management team carefully monitors the work of editors to ensure that every article is up to a high standard of quality.
There are 8 references cited in this article that you can see at the bottom of the page.
This post has been viewed 9,609 times.
Regular water changes are an important part of freshwater aquarium care and maintenance. Partial change of tank water allows you to control levels of contaminants and toxins more closely. To do the water change, you need to have clean water ready and suck the dirty water out of the tank. You can also combine cleaning of the substrate and removing algae on the walls of the tank, then gently add clean water to the tank so as not to affect the fish and have a nice clean aquarium.
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