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Building Underwater Wonders

Your Trusted Aquarium Experts in the Valley of the Sun with aquarium maintenance and design across the entire state of Arizona.

25+ Years of Experience in Custom Designed Aquariums, Aquarium Supplies, Fresh & Salt Water Fish, Livestock, Invertebrates & Corals.

About Us

Who Is That BIG FISH Store ?

We are a collaboration of several valley aquarium companies that have been in the aquarium business since the late 1980’s. We have built That BIG FISH Store to be a home for Southwest Seas, Custom Marine Aquaria, Aquatic Environments Manufacturing, Arizona Fishguy and Seaquest Aquariums.

Clownfish in Green and Purple Anemone
Surgeonfish up Close
Betta Fighting Fish
Betta Fighting Fish

Our Commitment

What Makes Us Different?

Discover the perfect aquarium system for your home at That BIG FISH Store, where we offer an extensive range of options and services to ensure your satisfaction for years to come.

Inquire with our knowledgeable sales associates about our maintenance services, which can cover everything from installation to ongoing care. Whether you’re a beginner or an experienced enthusiast, and whether you’re interested in a compact Nano tank or a sprawling wall-sized masterpiece, That BIG FISH Store is your ultimate destination for achieving saltwater success!

A Commitment to Health

We do our absolute best to ensure we are purchasing and subsequently selling healthy animals for your aquariums. We purchase from companies that we have been doing business with for most of our collective careers.

100% Customer Satisfaction

We are not perfect. We will make mistakes. We will do our best to ensure we have happy, fulfilled customers at the end of each day. If you are not satisfied with us for any reason, reach out to us and let us help work toward a resolution.

Our Expertise

Marine & Tropical Fish Experts

Explore That BIG FISH Store, boasting an impressive stock brimming with an extensive selection of goldfish, Koi, tropical, and saltwater fish. This is your go-to destination for discovering rare and unique fish species. With new arrivals almost daily, you can look forward to weekly specials on fish, invertebrates, corals and aquariums.

Make your way to That BIG FISH Store not only for the fish but also for the exceptional people behind it. Our dedicated team of fish and coral experts takes pride in offering valuable advice and ensuring your success in the world of aquatic enthusiasts.

Marine Fish

That BIG FISH Store is your premier source for marine species. You'll benefit from the assurance of having a team of experienced experts and access to the most extensive marine livestock selection.

Marine Fish

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Tropical Fish

Select That BIG FISH Store as your go-to destination for all your freshwater aquatic needs. Whether you're in search of fish, live plants, or aquarium decor, rest assured that our team of highly informed experts is here to assist you.

Tropical Fish

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Aquariums & Supplies

Custom & prefab aquariums are our specialty. You'll discover everything required to maintain your tank and keep your fish in top-notch condition at That BIG FISH Store.

Aquarium Supplies

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Corals & Invertebrates

That BIG FISH Store is your one-stop destination for all the essentials required to bring your dream reef tank to life! Our commitment is to offer the finest selection of corals and invertebrates available for sale.

Marine Invertebrates

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Freshwater Plants

At That BIG FISH Store, we're your ultimate destination to fulfill every need for creating your dream tropical aquarium! We're dedicated to providing the finest array of freshwater plants for sale, ensuring you have access to top-quality options to bring your aquatic vision to life.

Freshwater Plants

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Nudibranch
Lionfish
close up underwater tropical fish with sea anemone
Polyp Coral
White Siamese Fighting Fish Betta
Shop Our Online Store Today

Explore our online fish supplies store for a vast selection of premium aquarium essentials, from filters and heaters to decorative ornaments and specialized fish food, ensuring your aquatic pets thrive in a healthy environment. Enjoy convenient browsing, secure transactions, and prompt delivery, making us your preferred choice for all aquatic needs.