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Best Rocks for Freshwater Aquarium 2020

Best Rocks for Freshwater Aquarium 2020

Rocks for freshwater aquarium should be inert. When you say inert, this conveys that the rocks should have no effect on the hardness or pH of your fish aquarium water. It is essential to note that freshwater terrains are regarded as soft water; as a result, putting the wrong types of rocks to your aquarium would just affect your water to be hard so your tank occupants will find it uncomfortable to dwell in.

To boot, an African Cichlids plus many other hard water originating freshwater fish are exclusions to where you could utilize calcareous rocks that do not contain salt. Basically, calcareous rocks contain calcium and are known to bring about pH and are also the cause of boosting hardness in tank water. It is usually beneficial to add clean wood that aids soften the water if you opt for a softer freshwater.

If you are currently in search of the best rocks for freshwater aquarium, take in mind that some of the inert rocks that are certainly risk-free options and could absolutely look appealing in your freshwater aquarium consist of plastic rocks, basalt rock, lava rocks, quartz, slate or shale.

Best Rocks for Freshwater Aquarium Reviews 2020

If you would like to shop for safe and natural rocks for fish tank, then this Royal Imports pebbles rocks will definitely be a great addition to your tank. This won’t only help make your aquarium look more attractive, but your fish and other invertebrates will surely love them too.

The common applications for this type of pebble rocks are for decorative concrete topping, flowerbeds, walkway paving, and groundcover. These are ideal pebble rocks that are deemed as an economical and permanent option to yearly wood composting.

  • Non-toxic and environment-friendly river rocks
  • Ideal for home decor and an artistic interior/exterior design
  • Excellent shapes that provide good drainage
  • Practical alternative to yearly wood mulching
  • Durable and does not deteriorate instantly

These rocks are highly recognized for being safe rocks for freshwater aquarium. They are hardscape types of stones that are specifically created by skillful designers to provide a more realistic presence that is ideal for Amano or Iwagumi kind of aquascaping.

You do not need to worry about the safety of your aquarium pets since these are all-natural stones that are non-toxic for shrimps and other plants, with minor changes to the chemistry of water. They are particularly utilized in creating a natural backdrop in your setup, bonsai garden, terrarium, conventional Japanese rock garden or biotope tank.

  • Reptile and aquarium safe
  • Fascinating rocks at a superb price
  • Come with premium quality and variety
  • Good embellishment for tanks and terrariums
  • Come with unique crevices, textures as well as shapes

The rocks are considered one of the best aquarium rocks that you can purchase since they are easy to aquascape. They are porous and there is no need for you to utilize any putty or glue just to stick them together.

As compared to other reviews that say these rocks are unreal, if you’re going to look closely, you will observe that they actually come with some browning on them which simply implies that this is one quality of an authentic dry rock.

  • Real dry rock from the Atlantic ocean
  • Premium quality
  • Great value for the money
  • Easy to pile and looks natural
  • Superb deal and variety of sizes

If you plan to shop for cool fish tank decoration ideas, the natural slate stone is a great pick. This works superbly in embellishing your home, as a ground cover for indoor plants and when designing vases and bowls that are displayed in your dwelling place.

They actually come in multiple uses and are a famous choice when crafting steps, caverns, archways, doll houses, model railways and the like. Since it comes in many different uses and is not only meant for aquariums, then it is safe to say that it is a practical choice to consider.

  • Ideal for constructing ground cover, fairy gardens, and walkways
  • Superb for vivariums, terrariums and aquascaping tanks
  • Exceptional shape and size for rock painting
  • Can naturally hold heat for reptiles
  • Attractive home décor in vases and bowls

This VORCOOL Aquarium Sea Rock Cave Ornament is one of the best rocks for aquariums because it looks somewhat realistic in the tank and comes with a fine size of three by up to ten-gallon tanks. With that, you can be guaranteed to give your tank occupants a great spot to hide and get out of the light whenever they prefer to.

If you are looking after a Betta, then make sure to sand down this rock’s edges to avoid any issue. The holes are adequately-sized so your Betta could glide in and out without the need to accidentally hit the sharp edges.

  • Ideal for Cory fish and bottom inhabitants
  • Provide a nice dark area for fish to chill in
  • Very attractive aquarium décor
  • Give the tank a more natural look
  • Can provide the necessary air to African dwarf frogs

If you are a tank owner, you would surely agree that it can be daunting to keep a safe haven for your aquarium friends at times. In addition, it isn’t easy to make your aquarium look fascinating not only to your guests but more so to your freshwater friends.

Luckily, with the aid of fish tank river rocks, you can create a wonderful dwelling spot for your freshwater pets and at the same time keep them risk-free at all times.

  • Can help add natural aesthetics to your terrarium or tank
  • Tan-colored and lightweight
  • Come with exotic-like specification
  • Packed with a good amount of premium quality rocks
  • Nice variety of sizes

Are you presently hunting for a premium quality lava rock in aquarium? Then, American Fireglass lava rock will work wonders for you!

We all want to invest in products that are premium quality, low maintenance, economical and can stand the test of time. By happy chance, these rocks come in a variety of sizes and come with a porous surface. They are especially ideal for fire pits, fire bowls, and other outdoor or indoor fireplaces.

  • Certified all-natural lava rocks
  • Ideal for indoor or outdoor use
  • Long-lasting and great value for the money
  • Easy to maintain
  • Aid in retaining moisture to plants

Undoubtedly, it is not a piece of cake to shop for big rocks for aquarium since there is a significant number of an option to select from. If you would like to avail something that comes in superb specifications, then you may check out Nature’s Ocean 12-Inch Coral Base Rocks for Aquarium.option

This product is capable of instantly adapting to the live environment and does not do anything negative to the cycle of your aquarium. It can serve as a naturally porous biological filter, does a very vital job in aquascaping and it is certified free of Biofilm.

  • Appealing tank decorations
  • Known for conserving natural reefs
  • Ideal for growing live corals, culturing live rocks and coral farming
  • Does not have a huge effect on the cycling of the tank
  • Biofilm-free and good for aquascaping

Underwater Galleries Cichlid Stones are nice to behold just like large river rocks for aquarium. They come in roomy interiors that are particularly intended for tank occupants to explore while at the same time providing shielded breeding niches for them.

This product is king because it is eco-friendly and won’t minimize or displace the amount of water in the tank. Moreover, it is formed with proper care and is certified hand-glazed to offer a more natural and attention-grabbing look of perfection.

  • Does not displace a huge volume of water
  • A piece of cake to set up and move around
  • Comes in several holes and caves in tiny space
  • Made of high-quality ceramic
  • Environment-friendly and lightweight

Would you prefer to purchase something that looks like aquarium river rocks? Surely, we always wish for a tank rock that can add beauty to our aquarium and at the same time can serve as our most cherished fish’s hiding and resting spot. Luckily, Penn Plax Stone Replica Aquarium Decoration Realistic Granite Look can give you all that.

Since every rock is isolated from each other, you could instantly organize the stones as per your fish needs and aquarium size. Take note that the bigger stones come with a flat top for the purpose of piling up and more stability.

What To Look For When Buying Rocks For A Freshwater Aquarium ?


Selecting rocks for your tank should be based on appearances, cleanliness, safety and best value. As a result, when buying rocks online or at local fish stores, you may ponder on the following guides below so you can pick the most thriving and healthiest rocks for your aquarium.

Following guides:

  1. Search for appealing rocks that are colored red, pink and purple. The reason behind this is because such colors are deemed as matured and healthy coralline algae colors which your tank inhabitants will certainly adore.
  2. Do not opt for rocks that come with slimy texture and black algae for these are evident signs of dead entities that may contaminate the aquarium in the long run.
  3. Choose rocks that have crevices and holes in them for these will serve as hiding or resting hubs for your tank occupants. These could also act as great bacteria colonies. Check if the holes or crevices are big enough for fish to hide or dwell in.
  4. Carefully check the rocks for any signs of living creatures that may be dangerous to your fish as well. If the rock does not look good, then better leave it there.
  5. When looking for rock decors for your tank, smell them first. If they smell rotten or fishy, then this could mean they aren’t cured.
  6. Ask yourself how much you are willing to spend for rock decors to be added in your tank. Then, adjust your options based on that. But, be reminded not to compromise quality. Do not go for cheaper options if these cannot guarantee the valuable specifications that must be considered when investing in aquarium rock decors.
  7. Inspect if the sizes of the rocks you are eyeing to buy will fit well in your tank. Make sure that you do not over-decorate the aquarium as this will only cause congestion and discomfort inside the tank.

Why do you need rocks for freshwater aquarium?

If you own an aquarium, then you must specially consider adding some safe and appealing embellishments inside the tank in order for your fish not to feel dull and comfortless inside. Without question, tank decors can considerably aid avoid make your aquarium look empty and not a good hiding or resting spot for your tank occupants.

For sure, a lot of people would prefer to stare at an aquarium that has adorable and stunning woods and rocks inside. Indeed, rocks and other decors assist in providing an identical look of the natural ecosystem for the fish. Up until now, there are some factors to be mulled over prior to putting these decors to your tank which were discussed above.

Now, let us explore on the benefits of adding rocks to your tank!

  • Some fish feed themselves with algae from woods or rocks on their natural ecosystem. Hence, putting rocks in the aquarium will provide tank occupants additional instinctual activities and this is advantageous for them to have a natural and healthy form of diet.
  • Rocks can provide a wonderful spot for specific bacteria to nitrify and create their territory. Moreover, these are good bacteria that aid ward off toxic substances like nitrites and ammonia from tanks.
  • Nearly all aquarium enthusiasts prefer to keep fish in an environment that is identical to their natural ecosystem. This is not as valuable as in the past because lots of fish these days are generally bred in confinement. Nevertheless, it is still wonderful to see fish inside an aquarium that is a replica of their natural habitat.
  • Since most fish tend to conceal themselves from people and other tank inhabitants, rocks are effective spots for them to hide. Rocks also help fish feel more protected if these are utilized for living in caves. And, rocks can serve as a potential breeding place or laying eggs for your tank friends.
  • Rocks can be beneficial in setting certain water parameters that your tank accounts especially require.
  • The most typical advantage of adding rocks to your tank is for visual purposes. Surely, the aquarium will look more attractive if you incorporate eye-capturing rock designs.

What are the different types of aquarium rocks?

There are 3 primary categories of the kinds of rocks that could be utilized in aquariums- each of them has its own sub-category. This consists of igneous, sedimentary and metamorphic rocks.

Igneous rocks that can be utilized in tanks comprise of basalt, gabbro, and dolerite. Sedimentary rocks consist of limestone, breccia, marl, conglomerate, sandstone, and shale. Meanwhile, metamorphic rocks include dolomite, schist, marble, quartzite, gneiss, phyllite, slate and hornfels. Hinging on the biotype, take note that all of these rocks must be appropriate for aquariums.

Where to buy rocks for freshwater aquarium?

Rocks for freshwater tanks can be purchased in different ways and from diverse sources and some of these consist of the following:

  • Garden nurseries or garden centers
  • Landscape firms that might sell sleek river rocks and other aggregates in a wholesale mode
  • Home improvement centers that have gardening departments in them
  • Various and trusted online shopping sites like eBay, Amazon and the like.

As you know, all of these sources can virtually provide you with less costly and attractive gravel and rocks. Take into account that you have to be careful in making your selections. It is advised to make it habit to test your gravel or rocks prior to utilizing them in a tank.


While it is true that adding stones or rocks to a tank is rapidly becoming a very renowned trend at present, still, it is better to administer a little research prior to making the final purchase. Make it a point that your rocks are aquarium-friendly and safe for fish. If you have problems with choosing what types of rocks to pick or you find it hard to identify them, you can consult your local aquarist for some assistance.

Laid on the line, it is seriously important to clean the rock carefully prior to adding them in the aquarium. Keep in mind that while decorating your tank with various plants and rocks significantly help make the tank look more attractive, some of these may only disturb or put them in danger; hence, you’ve got to ensure that what you add in the tank won’t make your tank inhabitants unhealthy and unhappy.

Hope the best rocks for freshwater aquarium reviews aforesaid are of great help to you!