11 DIY Aquarium Decor Plans You Can Make Today (With Pictures)

If you’ve ever set up an aquarium before, you likely know just how expensive aquarium decorations can get. Even for a small tank, you may spend upwards of $50 to get your tank set up just how you envisioned it.

DIY aquarium decorations are a fantastic way to save money and create a one-of-a-kind décor that suits your tastes perfectly. Sometimes, you may even be able to use extra supplies you already have lying around the house, saving even more money and avoiding a trip to the store. Here are some of our favorite free DIY plans for creating unique and affordable aquarium decorations.

The 11 Plans for Building Your Own Aquarium Decorations

1. DIY Aquarium Tunnels by Rad Linc Crafts

This simple DIY aquarium tunnel plan will fill your tank with tunnels in no time. You can cut PVC pipes to fit your space, but pre-cut pieces like Y-connectors are best because they don’t contain sharp edges. If you decide to cut your own PVC, sand the edges until they’re smooth.

With just three items, you can have aquarium tunnels in your tank by this afternoon. Make sure to select an aquarium-safe glue or silicone for this project.

2. Aquarium Stone Terrace Cave by PetDIYs

This stone terrace plan is a little more complex and requires knowledge of working with cement. You’ll use air-dry clay to create a terrace cave to fit your tank. Once the clay has dried, you’ll use silicone rubber to cover the clay, which will then create a silicone mold.

Once the mold is made, you’ll have to carefully fill it with cement. Avoid contact with wet cement on your skin, which can cause injuries. Once you’ve created your molded terrace cave, it’s time to kick up your feet and wait. It’s recommended that you let this item sit for around a month before adding it to your tank.

3. DIY Slate Terrace by Diiz iz Re4L

This stacked slate décor is incredibly easy to make and can be ready to roll in a matter of hours. Slate is the recommended stone for this project, but you can use any flat, aquarium-safe rock that you have on hand. Make sure to sand down any sharp edges on the stone to prevent injuries to your fish.

Aquarium silicone may be the best adhesive for this project since you’ll be adhering rocks together, but some aquarium-safe glues can also be used. Make sure to allow the glue to fully cure before adding it to your tank.

4. DIY Aquarium Planter by PlantedTank.net

This DIY aquarium planter is a fantastic way to anchor your plants in a bare-bottom tank and keep them in place if you keep fish that like to dig in the substrate and uproot plants (we’re looking at you, goldfish).

You’ll only need a few simple items you likely already have around your house to create this planter. You can add weight to its base to help keep it in place. If you’re not crazy about a 2-liter soda bottle hanging out in your tank, you can use aquarium-safe glue to attach rocks and moss to the outside of the planter, allowing you to disguise it.

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From diagnosing illnesses and providing correct treatments to proper nutrition, tank maintenance and water quality advice, this book will help you to ensure your goldfish are happy and to be the best goldfish keeper you can be.

5. Styrofoam Aquarium Background and Faux Roots by Kevin Wilson

Styrofoam boards and spray foam make great aquarium decorations. They can create something incredibly unique and natural-looking. This Styrofoam aquarium background is a great way to add texture and a distinctive look to your tank without breaking the bank.

This project requires some knowledge of working with spray foam, so if you are new to this medium, there may be a learning curve. Ensure that any products you’re working with are aquarium-safe. Some paints, foams, and adhesives contain ingredients that can be deadly for your fish.

6. Floating Aquarium Island by Aquatic Art

This floating aquarium island looks more complicated to assemble than it actually is, and it will have everyone wondering how you did it. You’ll need a handful of supplies, but this project shouldn’t take too long to create.

Securing the fishing line to the rocks can be difficult, but you can use glue or silicone for security. You don’t want rocks falling on the bottom of your glass tank. Choose mosses or other plants that will happily grow attached to rocks, and you’ll have floating islands in your tank in no time.

7. Custom Aquarium Background by Dramatic Aquascapes

Once again, we’ve come to a project that isn’t overly complex but requires experience working with cement. This DIY aquarium background consists of Styrofoam that has been shaped to look like rocks, which is then covered with colored cement.

You can make your tank’s background look however you want it to, and using colored concrete gives you more options than buying a premade background.

8. Painted Aquarium by PetDIYs

If you’re looking for the perfect way to express yourself with your aquarium, look no further than this painted aquarium DIY. You can create your own completely unique designs outside your tank. Wet-erase markers allow you to draw out your design and make changes before finalizing everything.

Glass paints permanently change the appearance of your tank, so make sure you are fully settled on your design before you begin painting. Keep the marker and paints on the outside of the tank, as many of the products are not aquarium-safe for use within the aquarium.

9. 3D Aquarium Background by Instructables

A 3D foam background for a freshwater aquarium lets you explore your creativity, giving you a blank canvas to make any design. It only takes a serrated knife to trim away a rocky background custom-fit to your tank. Skewers support protruding sections to give your fish more features to enjoy.

Building and dry-fitting the background to fit your tank is time-consuming but fun. The most challenging part comes in applying the multiple layers of cement. It’s incredibly messy, and each coat takes several hours to set. But afterward, you get to enjoy painting and finishing up an authentic-looking underwater rock feature.

10. PVC Aquarium Decorations by Ordinary Fish Keeper

Making these realistic PVC aquarium decorations takes a cleverly simple shortcut that makes the whole experience more fulfilling. You only need an angle grinder to carve organic grooves and chipped chunks from the piping, an almost perfect mimic for hollowed-out forest logs.

After applying several layers of brown paint for a more vivid textured look, your fish will be ready to enjoy their new hideaway. Before you add them to your tank, use hot glue to connect the pieces and give your stacked faux log aquarium decoration a lasting arrangement.

11. DIY Aquarium Decoration by Franks Place

Crafty doesn’t always mean complicated. A DIY rock tunnel decoration only requires a few angled PVC fittings and fire pit lava rocks glued together with water-safe silicone.

Combine the fittings in any shape you want before gluing rocks over the outward-facing surfaces. After a rinse to remove dust and prevent cloudy water, your lava rock decor is ready to entertain your fish. Alongside the PVC tunnels hidden behind the rock facade, natural gaps in the structure will give your fish more ways to play.

Conclusion

We hope you enjoy making one of these DIY aquarium decorations. There is a DIY plan for almost everyone on this list, whether you want a straightforward project or something a bit more involved. If your fish could speak a human language, they will thank you for the creative addition to their home!

See also:

• Male vs Female Vizslas: What’s the Difference? (With Pictures)
• Best Aquarium Backgrounds – Reviews & Top Picks

Featured Image Credit: naomi tamar, Unsplash