How to Cure and Prevent Cloudy or Green Water
There are a number of potential causes for cloudy or green water in a fish tank or aquarium. It is important to be able to determine the cause of the cloudiness or green color in the water so you can correct any problems in the tank. For this reason, even though there are chemicals you can purchase at your local pet store, this should not be your go-to for clearing the water your tank. Yes, they will clear the water, but the underlying cause of the cloudiness or green color will persist.
Some of the reasons water becomes cloudy or green are essentially harmless or will resolve themselves over time and others are representative of an issue that needs to be dealt with. Cloudy water and green water are entirely separate issues, with different causes. Let’s first take a look at curing and preventing cloudy water and then examine how to cure and prevent green water.
Cloudy water in your aquarium is not always an indication that something is wrong. In fact, in most cases, the cause of the cloudiness will be resolved on its own or with the help of the filter and you don’t need to do anything. However, anytime the water looks cloudy, it is important to assess the situation and the environment to determine the cause. Once you know the cause, you can eliminate it if need be and get rid of the cloudy water.
If your aquarium is new and you haven’t even had any fish in it, yet the water has turned cloudy, the problem is probably due to accessories in the tank. If these accessories are new and haven’t been properly rinsed off prior to introducing them to the tank, they can cause the water to turn cloudy. If it is an accessory that is safe for use in aquariums, then the filter and/or regular water changes will remove the cloudiness. If the accessory is not intended for use in an aquarium, it may be dissolving or disintegrating in the water, which is dangerous for your fish. The object should be removed and the water completely changed.
If you have had fish in your aquarium for a few days to a couple of weeks (depending on the number of fish in the tank) and the water has turned cloudy, it is likely due to the fact that the filter hasn’t completely cycled the water yet. The filter is responsible for cleaning the water of the waste left by the fish. If the setup is new, the filter takes time to go through one full cycle. Once it does, the cloudiness will be cleared up.
Sometimes when an aquarium has only been set up for a few minutes or even hours or it has just had a large volume of water changed, it can have a gray cloudy look to it. This is due to tiny bubbles of oxygen that are suspended in the water. You may have seen something like this in a freshly poured glass of water. This is nothing to worry about; the bubbles will dissolve in the water or make their way to the surface.
If you have wooden accessories in your aquarium, they can sometimes release tannins into the water. If your aquarium water looks like weak tea and you have any wooden accessories, then this is the cause. This cloudiness and the tannins that cause it are usually for your fish. However, if this happens, be sure to monitor the PH of the water regularly because the tannins might soften the water and cause the PH to drop. If this happens, you will need to adjust the PH level of the water.
If you have had an aquarium for a long time, then most likely you won’t deal with cloudy water, unless you introduce new accessories into your tank or have just change a large amount of water. More likely, with older aquariums, you will have a problem with your water turning green. Green water in your aquarium means you have an algal bloom. Yup, you read that right. Just like the algal blooms you may have read about in the news that fill up many of our lakes and oceans, your aquarium water can be filled with an algal bloom.
In general, the presence of algae in your aquarium is a good thing. It’s a sign of a healthy tank that can support life. However, you don’t want this growth of algae to get out of control and form an algal bloom. Algae on the glass is beneficial but algae in the water is unsightly. There are a few reasons why there could be too much algae growth in the water, including the following:
Overfeeding: Whenever you feed your fish, there should be no food left floating in the water within a few minutes after feeding. If there is leftover food, then you are giving your fish too much and it could cause algal blooms to form. You can easily fix this problem by reducing the amount of food you give your fish.
Infrequent Water Changes: Algal blooms can grow quickly if there is too much time between water changes. Be sure to do small water changes regularly to prevent the buildup of nitrates, something algae thrive on. If your tank hasn’t had any water changes in a while, then you need to do a few large water changes a few days apart, replacing as much as 25%-30% of the water each time, until the tank is clear.
Too Much Light: If water changes and feeding are under control, then too much light might be the culprit. Algae thrive on light, so cutting back on the amount of light your aquarium is getting might just solve the problem.
Healthy Water Means Healthy Fish
Just remember to assess the situation any time the water in your aquarium doesn’t look right. While it might not amount to anything important, you probably don’t want to risk the health and safety of your beloved pets by ignoring the situation. Keep a close eye and keep the water clean to have happy fish you will enjoy for a long time to come.