How to Clean Aquarium Rocks of Algae: 3 Homemade Solutions That Can Help You Remove Algae

To clean aquarium rocks of algae, let them dry completely, remove any accumulated water from the rocks by rinsing them off with fresh water, and use a cleaning solution designed for aquarium glass or limestone to remove algae and any other buildup.

3 Solutions for Cleaning Algae From Aquarium Rocks

1. Vinegar

It can be rugged cleaning aquarium rocks of algae, but it’s doable with a bit of vinegar. It’s even easier than you think. So you need 1 part vinegar to 1 part water, and you can start cleaning immediately. 

Just spray the vinegar mixture onto the algae, and scrub it off with a sponge or your hands. If it doesn’t seem to work, repeat the process until the algae are gone. Once you’ve removed the algae, be sure to rinse the rocks off thoroughly before adding new decorations or plants. Remember to do this every time you clean your aquarium!

2. Bleach

Cleaning aquarium algae rocks using bleach is easy with a few simple steps. First, to clean aquarium rocks of algae using bleach, mix half a part bleach with nine and a half parts water and pour it over the rocks. Then, let the mixture sit for 5 minutes to allow the bleach to work its magic. 

Then, rinse the rocks with clean water to remove all traces of algae. Repeat the process as needed until the rocks are free of algae. 

3. Hydrogen Peroxide

Hydrogen peroxide is a safe and easy-to-use solution that can remove green algae from aquarium rocks with little fuss. Just spray hydrogen peroxide onto the algae, and watch it disappear in moments. 

Cleanup is easy – rinse off the rocks with water. Hydrogen peroxide is safe for fish and plants, so that you can use it without worry. Try hydrogen peroxide if you want your aquarium rocks to look their best!

Causes of Algae Blooms – And the Solutions

Algae blooms can be a nuisance for aquarium keepers and ruin an aquarium. Luckily, a few tips can help prevent them from happening. For example, check your aquarium for signs of overfeeding or underfeeding fish – if you see any, change your fish’s diet accordingly. 

Additionally, remove food leftovers and debris buildup from gravel and glass surfaces. High water levels, poor drainage, and lousy fishkeeping practices can cause algae blooms. 


Nitrates are a common and unavoidable pollutant in water ecosystems. They can cause algal blooms, which deplete the water’s oxygen levels and can lead to fish kills. To keep your aquarium nitrate levels low, keep an eye on the water parameters (temperature, pH level, hardness) and adjust them to keep nitrate concentrations low.

Test for ammonia and chlorine levels before adding new fish or plants to your aquarium – they should both be at zero! -Always try to reuse aquarium water rather than buying so-called “fresh” water that has already been treated with nitrogen compounds.

Inadequate Filtration

Aquarium fish need water that is of high quality and free from toxins. However, a lack of filtration or poor water quality can lead to fish health problems, algae blooms, and even tank destruction. To address these issues, you should change the aquarium’s water at least once a week – this will help to remove harmful toxins and maintain good water quality.

Always follow the cleaning instructions provided by the manufacturer – doing so will prevent any damage. Keep an eye out for changes in your fish’s behavior – if they seem stressed or aren’t eating well, it is probably time to clean their tanks!

Aquarium water should be changed regularly, kept at the right temperature, and free of debris. Filters will help remove lousy water quality while providing clean water for fish.

Old Lights

Old lights – from the fixture or wiring – commonly cause algae growth. If you have light fixtures with incandescent bulbs, upgrading them to LED lights is best. Instead, they consume less energy and produce less heat, which helps reduce bacterial growth and promotes healthier tank conditions.


Heat is one of the main reasons that algae growth in aquariums occurs. Cleaning your rocks regularly and keeping your tank warm will help to reduce this problem. In addition, water quality can be a source of trouble for fish and plants alike, so keep an eye on it and correct any problems as soon as you notice them. 

Finally, adding good bacteria (such as live-food pellets) will help accelerate the growth of aquatic plants in aquariums.

Problems Caused by Algae in Aquariums

Algae is a problem that can plague aquariums of all sizes. It can cause many problems, from blocking light to causing water circulation and food shortages to becoming embedded in tank gravel. 

To clean algae off aquarium rocks, use a strong stream of water to blast it off. If necessary, use a hose to get the job done quickly and efficiently. Lastly, be sure to rinse the rocks thoroughly to remove any debris. Cleaning algae off aquarium rocks can be a breeze with a little effort.

Lack of Oxygen

Algae is a common problem in aquariums, and while there are many ways to get rid of it, some algae strains will thrive in an aquarium without much oxygen. However, if the algae growth becomes excessive or persists even after trying the above methods, it may be time for a new tank or filter setup.

Lack of Nutrients

If your aquarium is suffering from a lack of nutrients, it’s time to take corrective measures. Algae thrive in an environment devoid of essential nutrients, and this is when problems start to surface. 

You can help correct the situation using an enzyme cleaner or a biological filter; however, before doing so, ensure all the algae has been eliminated first. 

You can do this through an aquarium rock cleaning kit, water changes, and gravel cleaning methods. Once rocks are clean, replace them with a new substrate every two weeks to keep your tank healthy and functioning at its best!

Cloudy Water

Algae usually cause a cloudy water problem in an aquarium. Algae can proliferate in dirty water and produce a thick brown sludge that settles on the aquarium rocks and filters. This causes the water to become murky and cloudy, making it difficult for fish to see their food sources. 

To prevent this from happening, keep your aquarium clean – with regular cleaning of the filter – and pH level stable if necessary. Depending on its specific properties, you can use various methods to remove algae from rocks. Be patient, though – clearing algae off rocks can take some time!

Filter Issues

A fish tank can become overcrowded with algae quickly if proper water circulation isn’t ensured. To prevent this from happening, you can use an algae eater to clear up the algae problem. 

However, ensure that the rocks are regularly cleaned so as not to accumulate organic waste and bacteria, leading to increased algae growth. Algae forms on aquarium rocks due to a lack of good water circulation – something that you can try and fix by using a gravel siphon or power filter.