Marine & Freshwater

(1199 results)
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4116)
$55.99 - $184.99
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+ 1 more
Aqueon Standard Glass Rectangle Aquarium
6 sizes
(218)
$11.49 - $94.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Large Power Filter Cartridges
(265)
$17.99
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Buy 1 Get 2nd 50% Off all Aquatic Media
+ 3 more
Fluval® FX6 Aquarium Canister Filter
(198)
$369.99
$419.99
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+ 2 more
Marineland Open Glass Aquarium
3 sizes
(105)
$14.99 - $149.99
Top Fin® Bow Front Aquarium Starter Kit -  36 Gallon
(451)
$110.99
$184.99
Free Same-Day Delivery, No Order Minimum!
Instant Ocean® Sea Salt
2 sizes
(79)
$21.19 - $52.99
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Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(221)
$8.99 - $17.99
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Fluval Aquaclear Aquarium Power Filter
4 sizes
(84)
$42.99 - $99.99
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CaribSea Super Naturals Aquarium Sand - Moonlight White
(94)
$19.89
$29.99
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Fluval® Plant Stratum Aquarium Substrate
(119)
$23.69
$28.99
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API® Freshwater Aquarium Master Test Kit
(293)
$35.99
$39.99
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Activ-Flora Floracor Black Planted Aquarium Substrate
(18)
$19.99
$24.99
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+ 1 more
Top Fin® Element EF-S Filter Cartridges
3 sizes
(357)
$8.99 - $17.99
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Top Fin® Aquarium Hinged Glass Top
7 sizes
(168)
$16.99 - $58.99
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Aqua Natural Aquarium Sand - Galaxy Black
2 sizes
(81)
$14.39 - $24.99
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CaribSea Super Naturals Aquarium Sand - White
(22)
$19.89
$27.99
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Seachem® Prime® Aquarium Water Conditioner
4 sizes
(357)
$3.79 - $16.69
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Zoo Med Mopani Wood Aquarium Ornament
4 sizes
(171)
$4.99 - $54.99
Buy 2, Get the 3rd Free select Aquatic Ornaments
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Compact Aquarium Heater
3 sizes
(461)
$14.59 - $33.99
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Top Fin® Premium Aquarium Gravel - Classic Beach
(64)
$7.99
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Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1460)
$12.99 - $45.99
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Aqua Natural Aquarium Sand - White
(58)
$14.39
$14.99
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Omega™One Frozen Blood Worms Fish Food
(194)
$9.99
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API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(351)
$2.29 - $52.79
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API® E.M. Erythromycin Fish Bacterial Infection Treatment
(74)
$17.89
$26.49
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Omega™One Frozen Bloodworms
(176)
$9.99
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Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(190)
$3.99 - $8.39
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API® Quick Start Aquarium Cycling Water Conditioner
3 sizes
(144)
$8.99 - $17.39
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Tetra® TetraMin Tropical Flakes Fish Food
4 sizes
(361)
$3.79 - $47.89
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Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(45)
$7.99 - $25.99
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+ 1 more
Top Fin® Silenstream Filter Cartridge - 3pk
(111)
$8.99
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+ 3 more
Omega™ One Frozen Brine Shrimp Fish Food
(86)
$6.99
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+ 1 more
Top Fin® Aquarium Airline Tubing
2 sizes
(96)
$4.99 - $7.69
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Tetra HT Submersible Aquarium Heater
(859)
$8.99 - $23.59
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API® Aquarium Salt
3 sizes
(185)
$8.99 - $112.49
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+ 1 more
Top Fin® Floating Glass Aquarium Thermometer
(232)
$3.99
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Top Fin® Fine Mesh Fish Net
(108)
$2.49
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Explore Our Extensive Range of Fish Supplies 

At PetSmart, we offer a comprehensive selection of supplies for both freshwater and marine fish enthusiasts. Whether you're setting up a new aquarium or maintaining an existing one, our range of products ensures your aquatic pets thrive. From aquarium decor to essential maintenance tools, find everything you need to create a vibrant underwater world. 

Freshwater and Marine Fish Supplies 

Our collection includes a variety of aquarium accessories and pet fish supplies designed to cater to the unique needs of both freshwater and marine environments. Explore our selection of aquarium decor to enhance the beauty of your tank, and discover top-quality marine aquarium supplies to support the health of your aquatic life. 

Essential Aquarium Maintenance 

Maintaining a healthy aquarium requires the right tools and knowledge. Our range of aquarium maintenance products includes everything from filters to water conditioners, ensuring your tank remains a safe and clean environment for your fish. Learn how to maintain pH levels and keep your aquarium filter running efficiently with our expert tips. 

Frequently Asked Questions (FAQs) 

What maintenance does a fish tank need? 
Regular maintenance is crucial for a healthy aquarium. This includes cleaning the tank, changing the water, and checking the filter and pH levels. 
Can I put tap water in my fish tank? 
Tap water can be used in your fish tank, but it should be treated with a water conditioner to remove harmful chemicals like chlorine. 
Should an aquarium filter be on all the time? 
Yes, an aquarium filter should run continuously to maintain water quality and provide a healthy environment for your fish. 
How to maintain pH level in an aquarium? 
To maintain the pH level in your aquarium, regularly test the water and use pH adjusters as needed. Consistent water changes also help stabilize pH levels.