Cinder Block Aquarium Stand Building Stability for Your Aquatic Oasis

Cinder Block Aquarium Stand:DIY Guide

The cinder block aquarium stands are insanely fragile and heavy. That’s why these are great options for displaying your aquarium. These stands are not just eye-catching but also easy to build. In order to make a DIY cinder block aquarium stand, all you need is some creative flair and a few cinder blocks.

Do you know what is the best material for a fish tank stand? And, what is the best surface for a fish tank? Let’s find the answers to all these queries related to cinder block aquarium stands in this article. Just follow the footprints of this topic and get more insights. Let’s go!

Planning Your Cinder Block Aquarium Stand

Planning a cinder block aquarium stand is a challenging task. But, if you want to take on this challenge, then a DIY cinder block aquarium is a great way to style your fish tank. 

You can plan to start with a basic one that does not have frills. After that, you can add some creativity and personality. Thus, there are endless possibilities for “Do It Yourself” ideas!

Consider the following things before creating a favorable stand for your fish aquarium:

1. Cinder Block Size:

Cinder Blocks are commonly known as concrete masonry units (CMU). These are the main materials to consider before starting with an aesthetically pleasing option for a decent aquarium stand. 

But, how big is a standard cinder block? The standard cinder block is 8 inches in height, 8 inches in depth, and 16 inches in length.

2.Aquarium size and weight:

Find out the size and weight of your aquarium. This may also include water, substrate, decorations, and equipment. 

Different tank sizes need different sizes of cinder block aquarium stands. That’s why it is recommended to use slightly larger blocks to distribute the load of the aquarium equally.

3.Wooden boards:

Try to select sturdy and appropriate wooden boards for the top surface of the stand. Polywood is also a good option to use if wooden boards are not available. 

The boards should be large enough to accommodate the entire aquarium base. This will create a stable and level surface. If you want to know about Epsom salt for aquariums.

4.Design and Measurements:

Plan the dimensions of your stand. The dimensions must be accurate based on the size of your aquarium. So, measure carefully to ensure that your stand will fit in your desired location. 

Plus, find the height for your stand according to your needs and comfort zone. Also, calculate how many cinder blocks you need according to the dimensions.

5.Stability & Safety:

Your cinder block aquarium stand must be stable and level. You can use leveling tools to adjust the cinder blocks and boards as necessary. This will prevent any tilting or wobbling. 

Moreover, as safety is paramount, double-check the stability of your stand to ensure that it can bear the weight without any risk of collapsing. This is crucial for the well-being of your fish. It will also prevent potential damage to your home.


Along with the above-mentioned planning and tips, don’t forget to consider the aesthetics of your stand. For example, you can paint or finish the cinder blocks and wood to match your room’s decor. You can also match it with the overall look of your aquarium.


Calculate the costs associated with your project. For example, you can estimate the cost of cinder blocks, wood, paint, and any additional materials. 

DIY cinder block aquarium stands are cost-effective compared to pre-made options. However, it is still important to stay within your budget.

Related article: Exploring the Pros and Cons of Sand in Your Aquarium

Considerable Sizes of Cinder Block Aquarium Stands and Some Tips:

The size of a cinder block aquarium stand is very important to consider. Let’s find the most common sizes of stands that you can choose for your reliable aquarium/tank.

1.40 gallon cinder block aquarium stand

Customization and Versatility:

A 40-gallon tank is smaller and lighter compared to larger aquariums. It gives more flexibility in design.

Material & Cost Efficiency:

You can still use cinder blocks and shelves for stability of the tank. Cinder block aquarium stands are cost-effective for a 40-gallon tank. You can also use smaller wooden boards here.

2.55 gallon cinder block aquarium stand

Space-Saving Options:

A 55-gallon tank provides a balance between size and versatility. Also, this is an excellent option for smaller living spaces.

Aesthetics and Finish:

Although functionality is essential, you can also focus on the aesthetics of your stand for a 55-gallon tank. You can paint or finish the cinder blocks and enhance the overall look of the aquarium setup.

3.75 gallon cinder block aquarium stand

Design and Construction:

If you want to build a reliable cinder block aquarium stand for a 75-gallon tank, it requires careful planning. As a 75-gallon aquarium is pretty big to handle at home, you need to be more careful about its construction and design.

Safety Considerations:

Larger tanks require more safety. Ensure your DIY cinder block aquarium stand is placed on a solid, flat surface. Double check the positioning of the tank on the stand to prevent any accidents.

  1. 125 gallon cinder block aquarium stand

Load-Bearing Capacity:

The load-bearing capacity of your stand is crucial to consider with a 125-gallon tank. So, use more cinder blocks for a big aquarium like this.

Durability and Longevity:

For a larger tank like a 125-gallon aquarium, it is vital to choose durable materials for the wooden components and cinder blocks. You know that properly treated or weather-resistant wood can help the stand last longer.

You can watch this amazing YouTube video about how to create a cheap but good cinder block aquarium stand within a few minutes. If you are a good DIYer, you can also create a beautiful and mesmerizing aquarium stand like him.

Are Cinder Blocks Toxic to Fish?

No, cinder blocks are not toxic to fish at all. The materials and ingredients used in manufacturing these basic concrete blocks are so safe for fish and other marine creatures. No hazardous or harmful thing is used in these blocks that can harm the water or fish in the water.

However, you need to be careful with the fly ash that often comes with cinder blocks. This is the real problem for the fish and gardening environment of your aquarium. 

Also, the corners and edges are abrasive for the fish because they get damaged when they bump on them.

Are Cinder Blocks Waterproof?

No, cinder blocks are not 100% waterproof. These blocks are more than 10% permeable to water vapors and water itself. This result shows that cinder blocks are not fully waterproof. But, they are water-resistant even though their water-resistant properly is lower than it should be.

Moreover, cinder blocks have a porous surface that allows air and water to pass through. They also have cracked mortar joints that can allow water to pass through the basements. So, you can use waterproofing walls to make your cinder blocks waterproof.

Does the Cinder Block Need To Be Sealed?

Absolutely yes! According to the observations of one of my Quora Digest colleagues, cinder blocks must be sealed. As you know, they are porous, so water can easily seep through them. So, if you do not seal them, you’ll face prevailing water issues.

You can apply a good sealing product to your cinder blocks. For example, “Seal-Once NANO + POLY Concrete and Masonry Sealer” is one of the highly rated products on Amazon that can solve your problem. You can also visit this link if you want to know if a hot-glue aquarium is safe for your aqua-pets or not: Source.


1.What can I use instead of an aquarium stand?

There are many alternatives to traditional aquarium stands. You can use custom-built furniture like cabinets, bookshelves, or sideboards instead of an aquarium stand. Plus, you can use brackets, wall-mounted shelves, DIY wooden frames, metal stands, concrete blocks, planks, and kitchen counterparts.

2.Can I use concrete blocks as an aquarium stand?

Yes! You can use concrete blocks as an aquarium stand. Basically, concrete blocks are also cinder blocks. These standard blocks are typically 8×8×16 inches in size. Moreover, concrete blocks offer better stability than any other block.

3.What tools do I need for building a cinder block aquarium stand?

You can use a few common tools like level, measuring tape, saw, drill, and screw for securing the wooden boards.

4.Can I modify an existing cinder block stand for a different aquarium size?

Yeah! You can modify an existing cinder block aquarium stand for a new and different aquarium size. And, you can do this just by adjusting the arrangement of the blocks and boards.


If you are looking for one of the most latest, cheap, and versatile materials to make aquarium stands, cinder blocks are the right choice. All you need to do is just adjust them after following some measurements and tips given above. I assure you, it’ll be one of the easiest projects of your life.

You can do this within a few minutes or hours. In addition to this, it is affordable to build a cinder block aquarium stand with just a little effort and right planning. Trust me, it’s going to be both attractive and functional!