How to Clean Fish Tank Rocks? Detailed Guide
Do your fish tank rocks appear dirty? Are the stones in your tank covered in algae growth? You’re not even aware of how to clean that?
Are your Fish tank Rocks covered in algae and decomposing organic debris? This not only gives a bad look to your aquarium but also is hazardous to your fish as well. The ideal technique to clean the rocks doesn’t involve vigorous washing, but rather a small amount of work each week.

So, in this post, I’ve detailed every step I use to clean the stones in my aquarium, whether they’re live rocks, decorative rocks, or gravel. Consequently, if you’re interested in finding out more, continue reading.
How to Clean Fish Tank Rocks?
There are 3 types of Rocks in any aquarium
- Decorative Rocks
- Live rocks
- Small Aquarium Stones
Let’s look at some cleaning tips for each of these kinds of aquarium rocks.
Aquarium Stones Clean-up
Your fish will have a better environment if you sometimes clean out the waste and trash that has become embedded in the gravel of your aquarium. You can simply clean your aquarium gravel at home, regardless matter whether you have a tiny aquarium with only one fish or a huge one with a variety of fish.
Let’s examine the best ways to clean tiny aquariums’ gravel substrate.
Stone Washing in Small Tanks
Take your Fish out of the Tank or Maybe NOT
It is simpler to remove a single little fish from the tank for stone cleanings, such as a goldfish or betta. Non-chlorinated water should be poured into a clean container that is as near in size to your fish tank as you can get. To gently transfer your fish from the tank to the container, use a drinking glass or a fish net.
However, keep in mind that removing fish is gonna cause a lot of stress for the poor creature. So, I suggest cleaning the rocks without removing the fish from the tank.
Take Out the Tank’s Accessories
Remove any plants or ornaments from your fish tank and unplug your water filter. Put these apart. Before starting the cleaning process, the tank should only be filled with water and gravel.
Use Purified Water to Rinse the Aquarium Stones
Pour your fish tank’s water through a colander gently. Agitate the colander as it is being sprayed with lukewarm water to remove any tenacious debris. Repeat this several times until the water is crystal clear.

Replace the Tank’s Stones
Re-spread the cleaned gravel throughout the aquarium’s bottom in a uniform layer. Reinstall your water filter and place any ornamental components in the proper positions.
Reposition your Tank
Fill up the water in your fish tank without chlorine. If your fish breed requires any other special requirements, such as water with a specific pH, then treat your tank accordingly. Once everything is in place, carefully lower your fish into the tank along with its holding container, allowing it to swim freely.
- For more information on the water requirements of your specific fish, speak with your neighborhood pet store.
How to Clean Aquarium Stones in Big Tanks?
Never Take your Fish out of the Aquarium
Do not remove your fish from the tank for cleaning if you have several fish or exotic breeds. The fish may experience stress if this is done for the extended period of time necessary to clean a larger tank.
Place a Plastic Bucket Next to the Tank on the Ground
Purchase a clean bucket that will only be used for cleaning fish tanks. Place it lower than the tank so that gravity may perform the majority of the work.
- Use caution while using household buckets that may contain chemicals from previous cleaning tasks. It’s wise to keep your pet’s supplies separate to prevent misunderstanding, even though you are only using this bucket to dispose of fish water.
Put the Gravel Siphon in Place
Place the gravel siphon’s cylinder end in the tank so that the aperture rests in the gravel at the bottom. Holding the other end of the plastic tubing in your hand and guiding it over the tank’s edge to the waiting bucket.
Negative Pressure is Created by Sucking on the Gravel Siphon’s Tubing End
After doing this, immediately place the tube’s end in the waiting bucket. Once you start sucking, the tube will experience negative pressure, which will cause the bucket to fill with dirty fish tank water. You desire this, but be careful not to suck for too long or you can get aquarium water in your mouth.
- Some siphons produce unique priming balls that initiate the siphon for you if you find it difficult to tolerate sucking on the tubing. Find one at a pet or aquarium store near you.
- Rest assured that drinking a small amount of water won’t hurt you.
To Remove Debris, Use the Siphon’s Cylinder End
Once the siphon starts, there is nothing you need to do to keep the pressure up. Press the open, submerged end of the siphon into the gravel while the water is still flowing freely. Circling the siphon mouth into the gravel while pressing it down will allow you to suction up debris as you move from one end of the tank to the other. Remove any gravel fragments that rise to the surface by shaking them off because only a small portion of the gravel will be drawn into the siphon’s cylinder by suction rather than the tubing.

- As you work, be aware of any materials being removed from the gravel. If not, bury the aperture even deeper in the gravel.
- You should be careful not to harm or shock your fish as you move the siphon around the aquarium. develop progressively
The Tank’s Water Should not Have More than 25% of it Drained
This might upset the equilibrium of helpful microbes in the tank. Additionally, because they are still inside, the fish require cleaning while you are doing it.
Throw away the Used Water
Remove the gravel siphon and place it aside after you have successfully vacuumed the gravel. Pour the dirty water from the bucket into the sink or the toilet to dispose of it. With hot water, clean the siphon.
Fill up the Tank
Once the gravel has been cleaned, fill your tank with non-chlorinated water to the desired level. Be sure to carry out any additional tasks that your fish may require, such as PH changes, if they have any.
How to Clean Aquarium Ornamental Rocks?
When performing your weekly water changes, scrub the decorative rocks in your aquarium with a scrubber or an algae scraper. You won’t have to deal with a lot of accumulated and decomposing fish and plant matter in this manner.

The best way to clean your ornamental rocks is as follows:
Clean the surface of your aquarium rocks using an algae scraper. (If they are too big, you can clean them in the tank. Pick up the smaller rocks and clean them by hand.)
As you remove the unclean aquarium water for cleaning, swish your aquarium pebbles in it. Make sure not to wash them in tap water because that would simply eradicate the beneficial microorganisms.
How to Clean Live Aquarium Rocks?
Unless your saltwater aquarium is experiencing a significant problem, you should avoid cleaning your living rocks, sometimes known as corals. Therefore, you should create a sustainable aquarium environment for your live rocks rather than scrape the algae off of them.
The right lighting, filtration, constant pH levels, and fish species that eat algae are requirements for creating a live rock aquarium ecosystem that is viable. Your live pebbles will receive a harmless, organic cleansing in such an atmosphere.

However, you must take the live rocks out of the aquarium if you need to clean them. After that, gently scrub them with a brush with soft bristles. Clean the live rocks and then give them a saltwater soak.
Allow the rocks to soak in the seawater for two to three days. In the interim, be sure to use an air stone to properly aerate the water in your aquarium. Place your living rocks back in your aquarium after giving them a salt water rinse.
Why It’s Crucial to Clean the Rocks in Fish Aquariums?
On the gravel substrate of your aquarium, leftover fish food, fish waste, and decomposing plant materials can all collect. Your aquarium gravel will become dirty due to all of these factors.
It might create harmful bacteria if left untreated, which could potentially harm your fish. The same is true for live and ornamental pebbles that you might put in your aquarium for fish.
Do Not Remove the Helpful Bacteria!
It is not necessary to wash the rocks in your aquarium every time you clean it. The helpful microorganisms that reside on the substrate of your aquarium may even be harmed by it.
Additionally, be careful not to thoroughly clean your aquarium rocks in order to get rid of all the debris on their surface. Only the helpful bacteria present in them will be eliminated by this. Additionally, unnecessary cleaning will disrupt the roots of your aquarium plants and deplete them of essential nutrients.
If aquarium rocks are thoroughly cleaned and scrubbed with soaps, cleaners, bleach, etc., it will be more detrimental than beneficial. Your aquarium pebbles should only be cleaned of ugly muck like slime, algae, and fish and plant excrement.
Frequently Asked Questions
What Stones Does Shade Complement Fish Tanks the Most?
The color and kind of substrate in a fish tank should be as similar to the fish and plants’ natural habitat as is practical. However, because most fish are adaptable, any color of the stone is OK as long as the tank is kept clean.
Does Gravel Work Well in Fish Tanks?
Fish tanks benefit from gravel, especially freshwater aquariums. By providing a home for helpful bacteria that remove trash from the tank, it provides biological filtration. Additionally, it improves the appearance of aquariums and provides fish with a comfortable habitat.
How Frequently Should I Clean my Aquarium’s Rocks?
Aquarium rocks should be cleaned using an aquarium vacuum at least once a month. Occasionally removing the gravel from the tank, cleaning it thoroughly, and then rinsing it with new water can be beneficial.
The Bottom Line on How to Clean Fish Tank Rocks?
Cleaning aquarium rocks sometimes is necessary to keep them free of rotting fish and plant waste. Such garbage may contaminate the environment of your aquarium and endanger your fish. The techniques listed above can be used to keep your aquarium rocks clean.