DIY Aquarium Decorations – How to Decorate your Aquarium?

Do you wish to embellish your fish tank? Do you desire originality for it? but cost-effective? You ought to try making your own tank decorations.

Making tank ornaments is a lot of fun because you can use all of your creativity and, best of all, you can make anything you want for a lot less money than you would pay to buy it. This is not at all a challenging technique.

As a result, I’ve described in this article various themes on which you can decorate your tank as well as the procedures for making various aquarium decorations. So make sure to read everything carefully, and you’ll be able to produce those wonderful things for your fish, too.

Here are some “Do It Yourself” Aquarium Decoration ideas.

1. A Small Aquarium with animal doll Decorations

This is the nicest gift you could give a friend or member of your family if you have to buy them something. A glass jar with a secure lid is used to create this little decorative aquarium. Since the cover is closed, ventilation can be provided by drilling holes in the cover.

A Small Aquarium with animal doll Decorations

At this step, get some little animal dolls and attach them to the perforated lids. The animals should then be painted in gold, along with the cover. The jar’s cover and bottom will be embellished with beautiful mosaics after being painted. After the décor is finished, the final and most crucial step is to fill the jar with as many aquatic creatures as you can.

2. Diy Fish Tunnel Aquarium Decor

You should check out this gorgeous fish tunnel if you own an aquarium! Another amusing feature for fish and other aquarium inhabitants is a fish tunnel. For this fish tunnel, all you need is a coke bottle, scissors, beads, and adhesive. Let’s see how to assemble it: cut the bottle’s top and bottom to create a hollow cylinder. After that, trim a kick from the cylinder’s side. One of the apertures of the cylinder is wrapped with a thread that has been strung with beads.

Diy Fish Tunnel Aquarium Decor

3. Aquarium Light Bulb

What do you think about a lightbulb-sized aquarium? Amazing, huh? A transparent spherical view of your aquarium is provided by the lighting. You must, however, open the bulbs. You must pay close attention to avoid breaking the bulb. Break off the bottom portion of the bulb using a hammer gently. Remove everything from the bulb and use a cotton ball to give it a thorough cleaning.

4. Decoration for Concrete Aquarium

This aquarium concrete decor’s paper base serves the goal of making the décor’s removal after completion simpler. The procedure is as follows: lay a piece of paper on your work surface, then pour dry cement on it. To create a rock texture, dip a coconut shell into the cement, making sure to coat every portion of the shell with it. After that, embellish the shell with ornaments like coral and oyster shells.

5. Easy Aquarium Castle You Can Make

You need a mold to create an aquarium cave out of cement. Grab a long piece of CD plastic, make several strategic holes for cave entrances, and then flip it over. After that, mold the plastic using a cement mixture made with enough water. It can be made thicker by adding two cement layers. After that, add the cave’s top and make patterns on the entire cave using a stick. After letting it burn, you can take off the plastic.

Easy Aquarium Castle You Can Make

If the cave starts to fall apart after the plastic has been removed, you need to add more cement to the fissures. The cave sealers can then be painted, and you’re ready to go. However, You can continue and add any more decorations you have in mind for the cave.

6. DIY Fisherman’s House Diorama Aquarium

The only adjective that can describe this fishermen’s home is superb! It appears so distinctive and organic from the tank. Cardboard and little wooden sticks are used to make it. As a template, the house was first constructed using a cardboard box.

The cardboard was taken out as construction progressed. Ultimately, the majority of the cardboard was utilized for roofing, while sticks made up every wall of the structure. The aquarium itself was constructed from acrylic glass and ceramic floor tile. The aquarium and silicone glass sealant was taken out. For the house to float inside the aquarium, a long leg was put into the structure.

7. Aquarium Cave

Here is another fantastic DIY aquarium cave project. In contrast to the previously stated cave, this needs a large number of tools and leftover materials to create a lovely and simple design. Dried coral, fake leaves, tape, wire, a cardboard box, cement powder, a mixing bowl, a long-nosed player, scissors, a palette knife, and a pencil are all on the list. Making the cave’s foundation is the next phase after obtaining all of these supplies and tools.

8. Instructions for Making PVC Aquarium Decor

When working on any DIY project, especially when cutting or creating grooves, always use caution! PVC pipes in the following lengths are required for this PVC aquarium: 6.75″, 5.5″, and 4″.

Then, cut a groove across the size of each piece with an angle grinder. After that, further, roughen the PVC pipes’ surface using sandpaper. This will make it possible for the paint to adhere to the pipes effectively. Apply the first coat of black acrylic paint using a sponge brush, followed by a second coat of dark brown paint. Make sure that each coat is inserted into the grooves.

9. Lighthouse Aquarium Decoration

This lighthouse decoration will look stunning in your aquarium! The lighthouse must be constructed using slats, pencils, wooden sticks, files, wood glue, clay, and calipers. When you have acquired all of these components, the next step is to create a form that will help you mold a brick. You can make however many bricks you want for your lighthouse. This might alter based on the size and length of the lighthouse.

Lighthouse Aquarium Decoration

10. Aquarium Gumball Dispenser

See how to convert your fully functional gumball machine into an aquarium by clicking here! Get a gumball machine, then disassemble everything. After sanding the components, paint them your chosen color. The first coat can be shimmer metallic, and the second coat can be high gloss spray paint. Secure the water-containing globe and add a filter and air pump. Connect everything first, then assemble the components and add any finishing touches.

11. DIY Aquarium Cave

The chimney flue was used to construct this aquarium cave! The same stone used to create the terracotta pots is also used to create the chimney flues. Another name for the chimney flu is cichlid. They mostly serve as fire tone or chimney caps, but they can also be extremely useful in aquariums.

DIY Aquarium Cave

The chimney flue is made up of one heavy but extremely useful element. The chimney flue doesn’t need any work, such as cutting or creating holes in it. It naturally already creates a cave. Simply raise it and place it sideways within the aquarium tank.

12. Making Coral Structures for Aquariums

A plastic bottle, metal net, aluminum foil, wire, white cement, Asian paints, enamel colors, and touch wood are needed to build this aquarium viral building. The plastic table must first be sliced into three small, circumferential rings. Use wire to affix foil paper around each circle after joining the three rings side by side to form a triangular shape. You can then start painting after this.

13. Diy Simple Concrete Bridge

Here’s yet another fantastic design concept for an aquarium utilizing concrete! To create an overhead bridge, use a beverage can as a mold. Create a sizable round mold next. Place the bridge in the circle once they have dried, then surround them with other gemstones.

14. Aquarium 3D Rocks Decor

In your aquarium, this 3D rock will look fantastic! It is a mold filled with a cement and water mixture. It is amazing that such a distinctive 3D decoration could be created so quickly. After shaping the rocks, you can paint them in any color you wish and further embellish them with tiny stones.

Related Post: Unique and Creative Aquarium Decorations for your Fish Tank

Here are Some of the Themes that you can work on for your Aquarium

After learning the fundamentals, feel free to use your imagination:

Get your home holiday decorated. Why should homes for people only be fun? In the holiday department of your preferred retail location, look for little decorations that are suitable for aquariums.

Include a background to adorn. Create a scenario to print and laminate after measuring the tank’s measurements. On the outside, fasten it to the back of your tank.

Recreate a scene from a Hollywood film. Everyone has a favorite film. Why not give the lead roles to your favorite fish? You can make a small underwater movie set for them to explore, but you can’t dress them up in costumes. The future? Maybe watching them be silly will give you the idea for a sequel.

Construct an old underwater metropolis. Recreate Pavlopetri, Atlantis, or Heracleion, Cleopatra’s lost metropolis, using your imagination.

Make use of your Legos. Your aquatic companion will be the one who will love your scale model of the Golden Gate Bridge the most because they have the opportunity to interact closely. Legos also adhere to extremely high safety regulations for the plastic they use and won’t discharge any form of chemicals into the water because they are designed with children in mind.

Your tank can serve as a canvas. You only need a set of Sharpies or other permanent, glass-staining markers for this project. Take out your pens and start doodling! Absolutely, right on the glass! Don’t worry about perfection either; stencils are always an option if you aren’t a natural Michelangelo.

Utilize imaginative lighting strategies. Corals, algae, and even the fish in your aquarium need light to survive. Simple colored lighting may be installed, and the tank can be decked out for the holidays.

Flower pots provide great hiding spots. Clay and ceramic flower pots are appropriate for aquarium use, and when set on their sides, they offer the perfect little tunnel for your fish to explore and hide in. There are paints that are safe for fish that are accessible online if you want to add some color to your decor. Just be cautious when doing your homework.

Create the ecosystem of your (the fish’s) dreams. Making your own aquarium scenery out of silicone and insulating foam is a more tough — and gratifying — project to tackle for a somewhat more committed enthusiast with a whole weekend to devote.

Use fish-safe glue and rocks. By creating your own caverns, arches, and other rock art for your fish, you may unleash your inner sculptor. Make sure to secure your design so that it won’t topple over or put your fish in any danger. Sanitizing any rocks you might be adding to the tank is also a good idea.

You can create your own vinyl decals. You can add a lot to your aquarium using vinyl stickers, whether you use a few to provide depth or many to make an adhesive background. Although custom-cut vinyl pictures are frequently inexpensive and simple to get online, owners of craft machines like the Cricut may create and print their own vinyl directly at home. You won’t need to be concerned about the material’s safety in regard to your fish because it will be on the outside of the tank.

Simply purchase a bottle, snip off the top and bottom, and you’ve got amazing décor. Take the center portion and make a cut through it afterward, then make three circles out of it. Use the three circles to create a flower, then continue the process until you have a sufficient number of blooms. A tree is the result of this.

What Risks can Homemade Aquarium Decorations Pose?

To put it simply, everything foreign you add to your aquarium can introduce toxic substances and other risks that endanger your fish. A freshwater aquarium’s pH level must maintain a delicate equilibrium, and the chemicals found in most everyday products can kill your fish. Any naturally occurring object with widespread bacteria that hasn’t been thoroughly cleaned puts your fish at risk. Additionally, your fish can be fatally injured by anything with sharp or rough edges.

What Components of my Aquarium may I Safely Use?

Relax now that you have our attention. You can still utilize a tonne of things to decorate the underwater house of your fish. The secret is to be aware of the repercussions and pick your components carefully.


Terra cotta clay pots and other dinnerware are generally acceptable to keep in your aquarium, but you should steer clear of those with lead or copper glazing. As long as they adhere to safety standards, decorative ceramic mugs and plates can make for amusing hiding spots for even the most cautious fish.


Food-safe goods typically make appropriate decorative objects but exercise caution. Avoid using single-use plastic products like water bottles or unpainted, unopened plastic toys since they may contain hazardous chemicals.


Grandma might have some lovely glass goblets in her collection that would brighten and evoke memories in the home of your fish but take caution. Look closely for any indications of cracks or jagged edges that could cause more harm than good.

DIY ornaments

If you explore outside of your neighborhood fish shop for inspiration, you’ll find an infinite number of decorative alternatives and be able to come up with something far more one-of-a-kind and personalized.

You may already have some appropriate decorations around your home, or you may decide to make your own or purchase some from another source.

Which Materials Bought I avoid using in my Decorations?

Naturally, certain items are just wrong for your aquarium. When in doubt, simply decline and use your best judgment. Following these useful suggestions can help you make informed decisions:


Water and metal do not mix, as you are well aware. Over time, metal objects will corrode and release toxic oxides into the water, killing your fish.


Driftwood and the majority of the treated wood ornaments sold in pet stores are acceptable, but you should stay away from all other wooden items. The chemistry of the water in your tank could be changed by untreated wood. You should also boil driftwood you find on the beach for one to two hours before using it to get rid of any spores or algae it could contain.

Beach sand

It is recommended to get sand for your aquarium from a pet store because it has been created specifically for freshwater aquariums. Regular beach sand could contain substances and microorganisms that are hazardous to freshwater ecosystems.

Rocks, coral, and seashells

These ornamental artifacts may bring back pleasant memories of trips or memorable hikes, but they also contain calcium and other minerals that may change the pH of the water in your freshwater tank.

Anything Consumable or Degradable

Many fish enjoy nibbling at the items in their surroundings or foraging for food on the tank floor. This makes it harmful to add anything they can eat that isn’t already a part of their diet.

Can I add my own real Plants?

The quickest response is “no,” and here’s why: Not every plant is ideal for underwater life, despite the fact that having live plants in your aquarium can significantly improve the water quality. Aquatic plants that thrive when submerged in water must be added.

Can I add my own real Plants

In the natural world, fish, birds, and other creatures can find food, shelter, and building materials in aquatic plants. These plants utilize CO2 and nitrogen, two nutrients abundant in fish waste, in your aquarium (carbon dioxide). Additionally, they release CO (oxygen), which can assist your fish in breathing.

There is a tonne of options. Five aquatic plants that you can find at your neighborhood pet store are listed below in brief:

  • Java moss is a favorite of shrimp and does well in low light.
  • Due to its affordability and resilience, Amazon Sword is a fantastic plant for novices.
  • Java fern is a cheap, slowly-growing plant that likes to cling to rocks or wood.
  • Pygmy chain sword is a low-maintenance plant that may be grown by both amateurs and professionals.
  • A simple-to-grow plant with lace-like leaves that spread out like a carpet is water wisteria.

The Bottom Line on DIY Aquarium Decorations

Your aquarium could be decorated in a variety of ways! The guide mentioned above includes some fantastic suggestions for aquarium decoration that may be done for little or no money. None of the concepts needed the use of power tools, and they were all original. Many of the suggestions even make use of leftover materials to make upcycling simpler for you. Check them out once again, then start working.

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