ADDING ROCKS AND WOOD TO YOUR FRESHWATER AQUARIUM

Adding Rocks and Wood to Your Freshwater Aquarium
Adding wood and rocks to your aquarium can enhance its appearance and make it a better environment for your fish -- learn how in this article.
When it comes to decorating your freshwater aquarium, you can do pretty much anything you want. While some people prefer to use novelty décor items in their tank, many individuals love the natural look of rocks and/or wood. Rocks and wood help to provide a more authentic look and often gives fish a habitat similar to their native one.  However, there are several important things to consider before adding either of these objects to your aquarium. This article will discuss these considerations along with the pros and cons of using rock work and wood in your freshwater aquarium.
 
Advantages
 
There are several advantages associated with using rocks or wood in your aquarium.
 
 Certain types of rock and wood can alter the water parameters in your tank naturally (in other words, without chemicals). For example, many types of rocks, such as Texas Holey Rock and Limestone, serve as a buffer and will raise the pH of your aquarium. Driftwood, on the other hand, will often lower the pH and soften the water.
 
 Some fish species eat algae off rocks or wood in their natural environment (some fish eat the wood itself). Providing these fish with rocks or wood in an aquarium setting allows them to do something instinctual while providing them with a healthy, natural diet.
 
 Rocks and wood provide a great deal of surface area for the nitrifying bacteria to colonize on. These bacteria help to eradicate ammonia and nitrites from your aquarium – important since both of these substances are toxic to fish.
 
 Many aquarists prefer to keep fish in a habitat as similar as possible to their native habitat. This may help to reduce stress in fish and can also give your aquarium a natural and authentic appearance.
 
 Rocks or wood can provide hiding places to fish that need this kind of environment to escape other aggressive species. It can also make fish feel safer if they are used to living in caves created by the rock or wood. Additionally, some species breed or lay eggs on these objects.
 
 The final advantage is purely aesthetic. Elaborate rock work or a beautiful piece of driftwood can often make your tank look spectacular. For hobbyists who prefer the natural look, it is hard to go wrong with adding stones or wood to an aquarium.
 
Disadvantages
 
There are also several disadvantages with using rocks or wood in your aquarium.
 
 If you keep a great deal of rocks or wood in your aquarium, it can be difficult to properly clean the tank without removing them all. Uneaten food and debris will often get trapped back in the rock work and will end up working its way down into the substrate beneath the rocks. Vacuuming this covered substrate is impossible unless the rocks are removed. If you decide to have a stack of rocks in your aquarium, be prepared to remove them at least once every one to two months to vacuum up this trapped debris.
 
 Rocks and wood also make it difficult to catch fish or remove dead ones. With so many places to hide, often a significant amount of the rock or wood needs to be removed in order to catch any fish (assuming they are not slow moving).
 
 Certain rocks or wood can be harmful if your fish prefer a certain set of water parameters that are the exact opposite of what the rock work or wood create. For instance, if you put driftwood in an African cichlid tank, the cichlids prefer a high pH while the driftwood is creating a more acidic environment.
 
 Most rocks weigh a great deal. The glass or acrylic used with aquariums is very strong, but not without limits. Do not stack too much weight against the back glass of the tank or stack too much weight on the bottom. A good precaution if you are going to stack a lot of weight up is to buy some egg crate at a hardware store, cut it to size, and put it on the bottom of your aquarium (underneath the substrate). This will serve to better disperse the weight of the rock work.
 
 Sometimes, rocks or wood can create a poor visual look. For instance, driftwood can stain your water with tannins if not boiled properly before its introduction. This may be the look you are going for if you want a “black water” aquarium, but you may also hate it. Also, rocks and wood provide additional surfaces for algae to grow on. A subtle layer of algae looks very nice on these objects, but if large clumps start to form, you may not like the look.
 
How to Tell if a Rock or Piece of Wood can be Used in an Aquarium
 
A common question is, “I found this rock (or piece of wood) outside – can I use it in my aquarium?” The answer is that there are several points to consider and test before placing these objects in your tank.
 
The first thing you need to do before using a piece of wood in your tank is to boil or soak it for several hours in hot water. Boiling the water will ensure that any bacteria present in the wood are killed while soaking it will make the wood water-logged so it will sink. If the wood is too large to fit in a sink or stockpot, put it in a plastic tub or trashcan and keep adding hot water. Soak and scrub the wood for at least 3 days and up to 7 days.
 
In addition to bacteria, wood (particularly driftwood) may also contain tannins. Tannins are not harmful to fish but they can change the pH of your tank water and will also stain it a yellowish brown color. Soaking and boiling can help to remove tannins from the wood but it will take a while – several weeks up to a month of soaking. Avoid bleaching the wood to speed up the process because while it may kill some bacteria, the effects may not be as long-lasting and it could contaminate your tank water.
 
Once your rock or piece of wood is clean, make sure it will not crumble in your aquarium. To test this, wash the object in some water, and brush it with a hard brush. Then let it soak in a bucket of water for 24 hours. Brush the rock again -- if a significant amount of the rock or wood is still flaking off, it is probably going to degrade in your aquarium.
 
Rocks that Affect Water Quality

Though specific preferences may vary from one species to another, most aquarium fish prefer a neutral pH when it comes to tank water parameters. This being the case, rocks that raise the pH or increase the hardness of your water should be avoided. Below is a partial list of rocks that are suitable for aquarium use, but that will raise the pH and/or hardness of your water:

 Limestone
 
 Texas Holey Rock
 
 Petrified coral
 
The impact these substance have upon your water is often overstated. If your water is already approximately neutral (in the 7s), these rocks are probably only going to raise the pH by several tenths. This is hardly enough to impact most fish. However, if you have slightly acidic water (less than 7) and intend to keep it that way, then these rocks can have a large impact on the pH. The effect also depends on the buffering capacity of your water (relates to the hardness or softness of your water).
 
If you are unsure whether a certain rock or piece of wood will impact your pH and/or hardness there are several methods you can use to test it. First, you can add some drops of vinegar to the piece of rock. If it fizzes, it is safe to assume that the rock will raise the pH. This method is not always accurate, however, and a more complete test is to drop dilute HCL (which you can find at hardware stores) and see if it fizzes. As an alternative, you can place the rock in a bucket of water for several days and see how it impacts the water by running pH and/or hardness tests.
 
You should also avoid rocks that will introduce heavy metals into your tank. Common culprits are rocks with rust spots on them and pyrite (fool’s gold). If you see metallic-looking veins running through the rock, it is generally not a good idea to introduce it to your aquarium. Pyrite should never be put in an aquarium.
 
Finally, be cognizant of where you found the rock or wood. Did you find it in a heavily polluted area? If so then it may contain contaminates that can kill your fish. Was the rock or wood submerged in water? If so, then there may be harmful bacteria or fungus growing on it. Just be aware of the environment the object came from and use common sense.
 
Recommended Rocks and Wood to Use in Your Aquarium
 
Below is a list of rocks and woods that are generally recommended for aquarium use. However, remember to think about the considerations discussed above as well as the environment you are creating in your aquarium. Not all of these rocks will work with every species of fish.
 
 Lace Rock
 
 Limestone
 
 Slate
 
 Texas Holey Rock
 
 Pumice or Lava Rock (assuming the piece of pumice will sink)
 
 Petrified wood
 
 Sandstone
 
 Quartz
 
 Mopani wood
 
 Bogwood
 
 Driftwood – if you purchase driftwood from a store, make sure it is aquarium safe and not only for reptile use – also, never use driftwood from the ocean in a freshwater setup
 
How to Use Natural Decorations Effectively

It is important to think about what type of decorations you use in your freshwater aquarium, particularly if they have the potential to impact the health of your fish. Beyond what you use in your tank, however, you should also think about how you use them. For many aquarium hobbyists, cultivating a freshwater tank is about more than just raising a few fish – it is about creating a beautiful, thriving aquatic environment right in their own home. This being the case, you need to think carefully about how you use your rocks and wood in your freshwater aquarium.
 

The key to establishing a “natural” appearance in your tank is to decorate carefully. Choose a variety of rocks and driftwood, not a bunch of pieces that are all the same size. Select one of the largest pieces to be the centerpiece of your aquarium and use the others as supplementary decorations. You do not necessarily have to put the largest piece in the middle of your tank, but where you put it is where your audience’s eyes are going to be drawn. To make your rocks and wood look even more naturally, try combining them with some live or fake aquatic plants. Adhering plants to rocks and wood is easier than you might think – plus, it can greatly enhance the appearance of your tank.

Conclusion

Adding rock work or wood can really enhance the beauty of your aquarium. However, you need to ensure that the objects you put in your aquarium will not adversely impact the environment. This article is meant to make you aware of the considerations you need to make in determining whether a rock or piece of wood is indeed suitable for your tank.

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Cichlids - Understanding the Different Types
Have you ever considered adding a cichlid or two to your freshwater tank?
Species Spotlight: Keeping Arowanas in the Freshwater Tank
Species Spotlight: Keeping Arowanas in the Freshwater Tank
The Arowana is a very large but graceful fish that makes a very interesting freshwater tank inhabitant.
Spotlight on the Wolf Cichlid
Spotlight on the Wolf Cichlid
The wolf cichlid is a large, aggressive species but makes a perfect option for a show tank.
What Are Good Freshwater Fish For Beginners
What Are Good Freshwater Fish For Beginners
What makes a freshwater fish a good candidate for beginners?
Top Freshwater Aquarium Bullies
Top Freshwater Aquarium Bullies
Some species of freshwater fish are simply more aggressive than others.
Freshwater Fish Article Database
Freshwater Fish Article Database
Articles on dozens of different freshwater fish and appropriate care.
Breeding (11)
Caring for Freshwater Angelfish Eggs
Caring for Freshwater Angelfish Eggs
Breeding freshwater angelfish can be a rewarding experience but raising the eggs to maturity may be a challenge.
How to Raise Cichlid Fry to Maturity
How to Raise Cichlid Fry to Maturity
Breeding freshwater aquarium fish can be a rewarding but challenging experience.
Breeding Mouth Brooding African Cichlids
Breeding Mouth Brooding African Cichlids
Learn how to succesfully breed mouth brooding African Cichlids.
Tips for Breeding Gouramis in the Home Aquarium
Tips for Breeding Gouramis in the Home Aquarium
Gouramis are some of the best community fish around because they are peaceful, hardy, and lovely to boot.
The Top 5 Tetras for Breeding in the Home Aquarium
The Top 5 Tetras for Breeding in the Home Aquarium
Breeding aquarium fish can be tricky, but with the right tank setup and preparation it can be done.
Tips for Breeding Silver Dollar Fish
Tips for Breeding Silver Dollar Fish
Silver dollar fish are a great addition to the community tank and breeding them can be a fun challenge.
Tips for Breeding Discus Fish
Tips for Breeding Discus Fish
Discus fish are one of the most colorful species of freshwater aquarium fish and they can be a joy to breed.
The Basics of Breeding Bala Sharks
The Basics of Breeding Bala Sharks
Bala sharks are a very popular species of aquarium fish.
Breeding Freshwater Fish
Breeding Freshwater Fish
Learn how to succesfully breed freshwater fish.
Breeding and Rearing Live-bearing Species of Fish
Breeding and Rearing Live-bearing Species of Fish
Live-bearing species of fish like guppies and swordtails are notorious for breeding in the community tank.
Breeding the Two Kinds of Betta Fish
Breeding the Two Kinds of Betta Fish
You may be aware that there are over 30 species of betta fish in existence but did you know that these species can be divided by their breeding habits?

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