14 best creative, unique, & themed fish tank & aquarium decoration ideas

Having pets is always beneficial. It doesn’t matter if you are a dog or cat person. These little animals are always welcome in any household. But if you are a busy person, you might not have enough time to spend with your pets.

There is no need to give up on your love for animals. There are various alternatives, such as owning and caring for fish. They are easier to maintain and don’t demand your constant attention. But it is important to ensure an ideal environment for them.

The fish tank is their entire universe, but this item is also a decoration in your house. That is why you should fill it with various decorations that resemble a natural habitat. Your fish can live a long and happy life when they notice familiar objects such as rocks or plants.

Additionally, you can also add handmade pieces that you find in some stores. Personalizing your aquarium gives it a unique theme, and there are various benefits of making the environment of your little fish more beautiful.

Take a look below where we show you the 14 best creative, unique, and themed fish tank decoration ideas. You can pick whichever you like the most, as there are plenty of options. 

aquarium decorations

Common fish tank accessories

While some decorations can be oversized and expensive, some people might want common fish tank accessories. Here are the best ones we could find, take a look at them and pick the one you like the most.

Otterly Pets Plastic Plants for Fish Tank Decorations

This set contains 8 beautiful artificial plants that feature bright and vivid colors. They will easily transform the environment of your fish tank, making it more vibrant and colorful. 

Because they are environmentally safe, these plants are made of plastic with a ceramic base. That means they will not rust over time and don’t change the pH of the water. Your fish will love these plants just as much as you will!

Otterly Pets Plastic Plants
2,349 Reviews
Otterly Pets Plastic Plants
They'll add some colors.

MyLifeUNIT Artificial Seaweed Water Plants for Aquarium

This artificial seaweed is built from two different parts. The soft leaves are soft and will allow the fish to swim through them easily. The ceramic base is strong and durable, easily holding the stand upright in your aquarium.

This company values quality the most, and its products always exceed market standards. The package includes 10 pieces featuring 3 different colors. They can be green, blue or red depending on your own choice. 

Aquarium theme ideas

Let’s proceed with some ideas that feature an aquatic theme. They go well with your fish tank, which will acquire a specific look with these decorations. They’ll love the party!

5,561 Reviews
Here's a bit of greenery.

SLOCME Aquarium Pirate Ship Decorations Ornaments

What’s more aquatic than a ship? With this realistic replica, your fish tank will feature a sunken ship’s ruins. It makes the little fish feel like sharks lurking at the bottom of the ocean. The natural scenery is gaining a new theme with this product, which gained many positive reviews.

This product is manufactured out of eco-friendly resin materials that do not pollute the water. Your fish will swim in a safe environment, as this decoration has no toxic features. The color will not fade as time goes by, and the scenery will be colorful even after a couple of years.

Skilled artisans helped design this product, crafted with increased attention to detail. There are no special maintenance rules, and this product is very easy to clean.

Pirate Ship
804 Reviews
Pirate Ship
We love this pirate ship.

Mermaid Figurines Decor, Rayberro Handmade Beautiful 7.28″ Resin Mediterranean Style

This small and cute ornament goes well with the overall aquatic style of your fish tank. Delicately and carefully designed, this decoration resembles a mermaid figurine that is highly durable and resistant to rust. You won’t have to worry about this product wearing out over time. 

This mermaid decoration will light up your aquarium, catching the attention of any guests that will see your fish tank. You can also place this decoration outside the fish tank in places such as nightstands, bookshelves, or anywhere in your room.

In symbolism, the mermaid is seen as the bringer of good luck, healing, and wisdom. With such positive energy, your fish will feel better in their new environment. The company is highly trusted and will quickly respond to questions if you want to contact them. 

Mermaid Figurines Decor
762 Reviews
Mermaid Figurines Decor
Your swimming fellows will love this mermaid.

Best creative & fun fish tank decoration ideas

Try the recommendations below if you want to get creative and try some fun ideas. They will expand your imagination and help you get inspired.

Fish Tank Decorations, Multi Design Optional, Resin Aquarium Ornament

If you are a Star Wars fan, your fish are Star Wars fans too. Most likely, you already know what this decoration resembles. It is an AT-AT Walker used in the franchise as a walking tank built by the Empire to destroy the rebel Allies.

This ornament is made of high-quality material, which ensures its durability. It is suitable for aquariums that can hold up to 20 gallons of water, and the vivid colors will increase the realism of your fish tank. 

The resin was used to create this decoration, making it suitable for fresh and salt water. As the years go by, you won’t have to worry about the sunken AT-AT fading out and changing color. 

There is a clever cave design on its abdomen where your fish can swim and hide. We bought this product for our office fish tank. We were particularly satisfied with the customer service offered by this company. The delivery was fast, and they helped us by answering our questions.

1,047 Reviews
Your friends can hide inside!

TEEMO Aquarium Groot Air Bubbler Decorations

Another creative idea inspired by the cinematographic universe is this Groot air bubbler. It will improve the aspect of your fish tank while also providing practical purposes. It is made of high-quality materials which protect the environment and is safe for your fish.

Before they package their products, the team at Teemo carefully checks them for imperfections or faulty pieces. That is why you will always get only their best items when you place an order. Because they are made of PVC, these decorations are durable and hard to damage.

If you still manage to destroy them, you can easily repair them with glue and some basic crafting skills. The height of this product is 3.9 inches, and its diameter measures 1.57 inches

Some customers are contacting the company with an issue, saying that their Groot air bubbler cannot stand straight. It is because there is trapped air inside. You should submerge this item underwater for about 15 minutes before placing it in its spot.

3,508 Reviews
Groot is cute!

Best unique fish tank decorations

Maybe you are looking for special decorations that you’ve never seen before. Here are some good examples to make your fish tank stand out. 

Sunyiny Aquarium Decorations Head Sculpture

This Buddha head aquarium decoration is a unique addition to your fish tank. It offers a natural environment feeling that your fish will enjoy as much as you do. If you place the tank in the hallway or living room, your guests will notice this beautiful decoration and show an interest in it.

It is made out of resin, a non-toxic material that is safe to use in aquariums with fish. This item has a height of 11.2 inches, so make sure your aquarium can easily fit it. The fish can enjoy swimming around this sculpture because it features vivid details. 

532 Reviews
We love this Buddha head.

Penn-Plax Castle Aquarium Decoration Hand Painted with Realistic Details

This hand-painted realistic castle will stand out on its own when it is placed inside an aquarium. Your fish will also enjoy this new addition, reducing their boredom. It is manually painted in shades of gray and represents a castle situated upon a rocky landscape.

While this is a great visual addition for humans, your fish will also enjoy this item’s passages and hiding places. On its own, the castle looks incredible and easily stands out. But when you add more decorations, the entire environment changes. The environment will be rich and detailed.

This decoration is double-sided so that you can place it anywhere inside the aquarium. You can use it in fresh and saltwater tanks, and you won’t have to worry about this item wearing out over time. 

1,207 Reviews
Your swimming friends deserve their own castle.

Best themed fish tank decor ideas

If you are looking for themed aquarium ornaments, look no further. We searched the market for the best items and picked these two as the best decorations you can purchase. 

wood look decoration

Penn-Plax Spongebob Squarepants Officially Licensed Aquarium Ornament – The Chum Bucket

If you love Spongebob, this ornament is the best choice for your fish tank. You can enjoy the magical world of Bikini Bottom right in your aquarium, which will feature a unique theme. This product has been inspected by a team of experts that ensured maximum safety for your fish.

With a sturdy base, you won’t have to worry about this piece floating around the tank once you place it underwater. This piece can get dirty with time, but cleaning it is relatively easy. All you have to do is to wipe it with a wet towel. 

Penn-Plax Spongebob Squarepants
3,200 Reviews
Penn-Plax Spongebob Squarepants
Who doesn't love Spongebob?

Penn-Plax Spongebob Squarepants Officially Licensed Aquarium Ornament – The Krusty Krab

Another officially licensed product that features the Spongebob theme is this ornament which resembles the Krusty Krab restaurant. Because it is hollow inside, most fish can easily fit through its windows. It allows them to swim freely around it. 

The material used to manufacture this decoration is safe for fresh and saltwater aquariums. With a sturdy base, you won’t need to fix them in place as they can easily stand on their own. Purchase both products and create a unique atmosphere inspired by Spongebob’s theme!

Penn Plax Spongebob Krusty Krab Ornament
1,535 Reviews
Penn Plax Spongebob Krusty Krab Ornament
Here is another one from Spongebob.

Best natural aquarium decorations

Your fish will want a habitat that is similar to the one they are used to. There won’t be any fancy decorations other than plants and rocks in nature. If you want to keep it simple, look at these decorations.

rock aquarium decoration

Tfwadmx Aquarium Natural Driftwood Decor Wood Branches

Each product is unique as natural driftwood features special shapes and various sizes. You can integrate these branches into your tank regardless of how many fish you have in it. These branches will release tannins once they come in contact with the water, which will help lower their pH levels.

These pieces are made of natural wood, so durability is ensured even while submerged underwater. The natural driftwood adds an authentic, realistic beauty. You and the fish will appreciate it. Perfectly matching with rocks and plants, these branches are a good addition to your fish tank.

Consider this product’s size and compare it to your own fish tank. Each branch is around 8.5 inches to 12 inches, so make sure they fit. The manufacturer recommends boiling these branches once your order arrives. 

Natural Driftwood Decor
39 Reviews
Natural Driftwood Decor
We love this driftwood.

Natural Slate Stone -1 to 3 inch Rocks

There’s nothing more natural and common than slate stones. These rocks will increase the beauty and realism of your fish tank. Each bag you order contains a mix of stones ranging from 1 to 3 inches. 

With high versatility, you can use these stones for various purposes, such as creating miniature gardens and decorating doll houses. But the manufacturer intended them for aquariums and fish tanks. You can glue them together using safe glue for your fish. 

This product features a natural gray color, which adds a shade of realism to your fish tank. When they are wet, their color darkens to resemble further the stones found in streams and rivers. To create a natural environment, you can mix several other stones with this product.

Natural Slate Stone
1,436 Reviews
Natural Slate Stone
It gives the space a more rustic feel.

Large fish tank decorations

For large aquariums, you need large decorations. While the smaller ones are ideal, look at these large-sized items that will stand out in your fish tank. 

Aquarium Artificial Plastic Plants Decoration, Pink Cherry Blossom Tree

This pink cherry blossom tree accurately replicates the natural environment. With a high level of realism, your guests cannot tell that this cool decoration is made of plastic. Your fish will enjoy the new addition as they can swim and hide through its leaves.

Because this is an artificial plant, you won’t need any complex light sources or other substrates to maintain the product. The beauty is constant throughout the years, as this decoration does not die or become unattractive over time.

Artificial Plastic Plants Decoration
768 Reviews
Artificial Plastic Plants Decoration
We love this pink cherry blossom tree.

NICREW Aquarium Volcano Ornament Kit, Bubbler Decorations for Fish Tank

This large decoration will easily stand out on its own, but you can add some extra items at its base. Featuring the form of a real volcano, this bubbler keeps a steady stream of oxygen constantly flowing into the water.

Your fish can enjoy the decorative purposes of this product as they can freely swim around it. This volcano is easy to install and can add a beautiful effect to your aquarium. Vivid colors and curtains of bubbles will make your fish tank stand out. 

NICREW Volcano Ornament Kit
1,655 Reviews
NICREW Volcano Ornament Kit
Air bubbles add a unique touch.


Do fish like decorations in their tank?

Decorations create a unique atmosphere, and they are beneficial both for humans and fish. For us, it represents something beautiful to look at that also enhances the environment of the aquarium. In the wilderness, fish are prey and often hunted. They will feel more comfortable in your aquarium as they will have places to hide when they feel exposed. While there is no predator in your tank, their instinct cannot be turned off. 

How can I make my aquarium look beautiful?

You can make your aquarium stand out by adding several decorations, such as rocks, driftwood, or even coral. These items will give a natural touch, and your fish will feel familiar in this original environment. But you can also use vividly colored pieces to spark curiosity in your little pets. 

Are resin decorations safe for aquariums?

Once it is cured, the resin is completely safe for your fish. It is the perfect solution for aquatic areas, and this material has coating and moisture-proofing qualities. Professionals and aquarium enthusiasts use waterproof resin when setting their tanks at home. 

How do I make my fish tank look classy?

If you want to make your fish tank stand out, you can do so by adding more decorations and items that will enhance the visual aspect. You can find various pieces on the market, and you can filter them by theme. You will find modern and minimalistic rocks and old and rusty castles featuring lots of details with increased realism.