5 Cool Fish Tank Themes You’ll Want to Replicate

By: Katrina RossosUpdated:

cool fish tank themes
Courtesy of sh0rtybabyyy/Instagram

5 Cool Fish Tank Themes You’ll Want to Replicate

Decorating a fish tank can be an incredibly enjoyable part of fishkeeping. Some hobbyists like to keep it simple; others go all out with elaborate themes. How creative you get when decorating your saltwater or freshwater aquarium is up to you.

Here are five cool fish tank themes to help inspire you to create an epic tank that all your friends and family talk about.

space fish tank theme
Courtesy of Casey Denham

1 A Space Tank That’s Out of This World

Shooting for the stars? Then landing on this space-themed tank just might be the inspo you’ve been looking for all along. It features an astronaut and a glowing planet, plants, rocks and gravel.

“When I decided to get a fish tank, I knew it had to be space-themed,” says Casey Denham, aerospace engineering student at Virginia Tech in Hampton, Virginia. “I really wanted it to be deep space and exploration themed, so I went with glow decorations.”

Best advice for taking on a tank theme that’s like nothing on Earth?

“Look for items that will look good when they glow together. The purple and blue look well, but the orange provides a good contrast,” Denham says.

Get the Look

Pure Water Pebbles Coated Aquarium Gravel, Jet Black
Sporn Static Cling Classic Black Aquarium Background

Temporarily out of stock

GloFish Aquarium Plant

2 Who Lives in a Pineapple Under the Sea?

If “SpongeBob Squarepants” was (or still is!) one of your favorite TV shows, then why not bring Bikini Bottom to your very own home? Well, your fish’s home, that is.

Allyson Piangenti, a fish tank owner living in Middletown, Connecticut, says she saw the Bikini Bottom fish tank décor years ago and always thought it would be fun to put together.

“I finally went ahead and did it [and] it was pretty easy,” Piangenti says. “I used all artificial plants, figurines by Penn-Plax and natural aquarium sand that was safe for both freshwater and saltwater tanks … I also found a picture [of a Bikini Bottom backdrop] on Google and had it printed and laminated for the background.”

Get the Look

Penn-Plax SpongeBob Pineapple Home Aquarium Ornament
Penn-Plax SpongeBob Squidwards Home Aquarium Ornament
Penn-Plax SpongeBob Krusty-Krab Aquarium Ornament

Temporarily out of stock

3 Finding Nemo and Dory in Your Home

“Finding Nemo” and “Finding Dory” are movies that have fish as main characters, so a tank in honor of both movies just makes sense.

To create a tank similar to this, you’ll need a coral background, brightly colored pebbles, Disney stickers and aquatic ornaments of Nemo, Dory, Hank and any other of your favorite characters from the movies.

Get the Look

Penn-Plax Crush Aquarium Ornament
Penn-Plax Nemo & Marlin Aquarium Ornament
Penn-Plax Hank On Sand Aquarium Ornament

Temporarily out of stock

Courtesy Of Flo_kaa/Instagram

4 Underwater Zen

Is creating a zen-like environment in your home important to you? Create a tank that’s equally as relaxing to look at as it is for your fish to swim inside.

To design a tranquil tank, add in some stone caves, a Buddha, ancient-looking architectural ornaments and some live plants, like the moss balls that are in this setup.

“Make sure your fish’s needs are your priority,” explains Florence Gosselin, a fish owner living in Montréal, Québec. You can buy decorations that are pleasing to the eye, but more importantly, that create a healthy living environment for the fish inside, says Gosselin.

You can even add a bubbler, like the Aqueon Flexible LED Aquarium Bubble Wand, which is calming to look at and, even better, helps circulate the oxygen in the tank.

Get the Look

Underwater Galleries Assorted Cichlid Aquarium Stone Caves
Pure Water Pebbles Natural Aquarium Gravel
Sporn 6-Piece Corner Column Aquarium Ornament
FREE 1-3 day shipping
Courtesy of Lauren Rawlins

Get Your Glow On

When in doubt, glow your fish tank out! This easy-to-execute fish tank theme is sure to make a bold statement in any room.

“It was easy to create,” says Lauren Rawlins, the tank’s owner who lives in Washington, D.C.

Rawlins says she used all of the items that came from a 20-gallon GloFish starter kit as well as a jellyfish, glow-in-the dark plant and gravel, and a light-up volcano bubbler to make this glow tank come to life. She also added in some live plants to give the fish a place to hide.

Get the Look

GloFish Aquarium Starter Kit
FREE 1-3 day shipping
GloFish Aquarium Anemone Ornament
Sporn Star Polyps Coral Aquarium Decoration

Temporarily out of stock

With all of these cool fish tank themes to choose from—and with the right fish tank accessories to help bring it to life—your fish tank accessories will stand out in no time.


By: Katrina RossosUpdated: