Marine & Freshwater

(1199 results)
Aqueon Standard Glass Rectangle Aquarium
6 sizes
(226)
$11.49 - $94.99
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Free Same-Day Delivery, No Order Minimum!
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4122)
$55.99 - $229.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Large Power Filter Cartridges
(269)
$17.99
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Save 40% on your first Autoship Order!
+ 4 more
Seachem® Prime® Aquarium Water Conditioner
4 sizes
(357)
$3.79 - $16.69
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+ 2 more
Fluval® FX6 Aquarium Canister Filter
(198)
$369.99
$419.99
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Spend $25+ get 2,500 points on all filters and media
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Marineland Open Glass Aquarium
3 sizes
(109)
$14.99 - $149.99
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Fluval FX2 Aquarium Canister Filter
(32)
$269.99
$319.99
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Spend $25+ get 2,500 points on all filters and media
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Fluval® 407 Performance Aquarium Canister Filter
(118)
$229.99
$269.99
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Fluval® 307 Performance Aquarium Canister Filter
(95)
$189.99
$199.99
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+ 2 more
Top Fin® Bow Front Aquarium Starter Kit -  36 Gallon
(453)
$184.99
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Free Same-Day Delivery, No Order Minimum!
Top Fin® Captivate Starter Kit
(412)
$134.99
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Free Same-Day Delivery, No Order Minimum!
Instant Ocean® Sea Salt
2 sizes
(79)
$21.19 - $52.99
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Fluval Aquaclear Aquarium Power Filter
4 sizes
(88)
$42.99 - $99.99
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Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(221)
$8.99 - $17.99
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+ 4 more
CaribSea Super Naturals Aquarium Sand - Moonlight White
(94)
$19.89
$29.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Freshwater Aquarium Master Test Kit
(293)
$35.99
$39.99
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Fluval® Plant Stratum Aquarium Substrate
(119)
$23.69
$28.99
Save 40% on your first Autoship Order!
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Top Fin® Fascinate Column Starter Kit
(294)
$71.99
$89.99
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Free Same-Day Delivery, No Order Minimum!
Top Fin® Element EF-S Filter Cartridges
3 sizes
(357)
$8.99 - $17.99
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+ 4 more
Activ-Flora Floracor Black Planted Aquarium Substrate
(18)
$24.99
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Top Fin® Corner Tank Aquarium Starter Kit - 6 Gallon
(332)
$69.99
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Free Same-Day Delivery, No Order Minimum!
Aqua Natural Aquarium Sand - Galaxy Black
2 sizes
(85)
$14.39 - $24.99
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Free Same-Day Delivery, No Order Minimum!
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Top Fin® Aquarium Hinged Glass Top
7 sizes
(172)
$16.99 - $58.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
CaribSea Super Naturals Aquarium Sand - White
(22)
$19.89
$27.99
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Top Fin® Compact Aquarium Heater
3 sizes
(461)
$14.59 - $33.99
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Free Same-Day Delivery, No Order Minimum!
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Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1462)
$12.99 - $45.99
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Spend $25+ get 2,500 points on all filters and media
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Top Fin® Premium Aquarium Gravel - Classic Beach
(64)
$7.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Omega™One Frozen Blood Worms Fish Food
(196)
$9.99
Buy 1, Get the 2nd 25% off all Frozen Fish Food
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+ 1 more
Zoo Med Mopani Wood Aquarium Ornament
4 sizes
(173)
$4.99 - $54.99
Buy 2, Get the 3rd Free select Aquatic Ornaments
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® E.M. Erythromycin Fish Bacterial Infection Treatment
(73)
$17.89
$26.49
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Aqua Natural Aquarium Sand - White
(60)
$14.39
$14.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Omega™One Frozen Bloodworms
(176)
$9.99
Buy 1, Get the 2nd 25% off all Frozen Fish Food
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+ 1 more
API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(351)
$2.29 - $40.99
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+ 2 more
Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(45)
$7.99 - $25.99
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Free Same-Day Delivery, No Order Minimum!
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Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(190)
$3.99 - $8.39
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Save 40% on your first Autoship Order!
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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
(363)
$3.89 - $47.89
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Top Fin® Silenstream Filter Cartridge - 3pk
(111)
$8.99
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Omega™ One Frozen Brine Shrimp Fish Food
(86)
$6.99
Buy 1, Get the 2nd 25% off all Frozen Fish Food
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+ 1 more
Top Fin® Aquarium Airline Tubing
2 sizes
(96)
$4.99 - $7.69
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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.