Marine & Freshwater

(1216 results)
Aqueon Standard Glass Rectangle Aquarium
6 sizes
(206)
$12.49 - $94.99
5X points (10% back in savings) on merchandise & services!
Buy any tank get 20% off entire stock substrate (excludes Gems)
+ 1 more
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4097)
$34.99 - $183.99
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+ 2 more
Top Fin® Large Power Filter Cartridges
(258)
$17.99
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Buy 1 Get 2nd 50% Off all Aquatic Media
+ 3 more
Marineland Open Glass Aquarium
3 sizes
(96)
$24.99 - $149.99
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+ 1 more
Marineland® High Definition LED Ensemble - 75 Gallon
(600)
$499.99
$799.99
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Top Fin® 36 Gallon Aquarium & Stand Ensemble Combo
(53)
$399.99
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Instant Ocean® Sea Salt
2 sizes
(77)
$21.19 - $52.99
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+ 2 more
Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(217)
$8.99 - $17.99
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Buy 1 Get 2nd 50% Off all Aquatic Media
+ 3 more
CaribSea Super Naturals Aquarium Sand - Moonlight White
(94)
$19.89
$29.99
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+ 3 more
Fluval Aquaclear Aquarium Power Filter
4 sizes
(84)
$42.99 - $99.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Element EF-S Filter Cartridges
3 sizes
(357)
$8.99 - $17.99
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+ 3 more
Activ-Flora Floracor Black Planted Aquarium Substrate
(16)
$19.99
$24.99
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Top Fin® Aquarium Hinged Glass Top
7 sizes
(158)
$15.99 - $54.99
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+ 2 more
API® Freshwater Aquarium Master Test Kit
(293)
$35.99
$39.99
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Top Fin® Half Moon Aquarium - 3.5 Gallon
(2047)
$39.99
$44.99
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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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Seachem® Prime® Aquarium Water Conditioner
4 sizes
(357)
$3.79 - $16.69
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Zoo Med Mopani Wood Aquarium Ornament
4 sizes
(167)
$4.99 - $54.99
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Buy 2 Get the 3rd Free Aquatic Ornaments (excluding Glofish)
+ 3 more
Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1456)
$12.99 - $45.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Silenstream Filter Cartridge - 3pk
(107)
$8.99
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+ 3 more
API® E.M. Erythromycin Fish Bacterial Infection Treatment
(74)
$17.89
$26.49
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Omega™One Frozen Blood Worms Fish Food
(194)
$9.99
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Free Same-Day Delivery, No Order Minimum!
Omega™One Frozen Bloodworms
(174)
$9.99
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Free Same-Day Delivery, No Order Minimum!
Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(45)
$7.99 - $25.99
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Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(188)
$3.99 - $8.39
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Save 35% On Your First Autoship Order!
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API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(351)
$2.29 - $52.79
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+ 2 more
Tetra® TetraMin Tropical Flakes Fish Food
4 sizes
(355)
$3.79 - $47.89
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+ 2 more
Omega™ One Frozen Brine Shrimp Fish Food
(86)
$6.99
5X points (10% back in savings) on merchandise & services!
Free Same-Day Delivery, No Order Minimum!
Tetra HT Submersible Aquarium Heater
(855)
$9.19 - $23.59
5X points (10% back in savings) on merchandise & services!
Save 35% On Your First Autoship Order!
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Top Fin® Aquarium Airline Tubing
2 sizes
(94)
$4.99 - $7.69
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+ 2 more
Top Fin® Floating Glass Aquarium Thermometer
(230)
$3.99
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+ 2 more
Top Fin® Fine Mesh Fish Net
(108)
$2.49
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+ 2 more
Marineland High-Definition LED Ensemble - 125G
(25)
$999.99
5X points (10% back in savings) on merchandise & services!
Buy any tank get 20% off entire stock substrate (excludes Gems)
Fluval® FX6 Aquarium Canister Filter
(197)
$369.99
$419.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Fluval FX2 Aquarium Canister Filter
(32)
$269.99
$319.99
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+ 1 more
Fluval® 407 Performance Aquarium Canister Filter
(118)
$229.99
$269.99
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+ 1 more
Fluval® FX4 Aquarium Canister Filter
(121)
$309.99
$359.99
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+ 1 more
Top Fin® Bow Front Aquarium Starter Kit -  36 Gallon
(437)
$147.99
$184.99
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+ 1 more
Top Fin® Captivate Starter Kit
(408)
$107.99
$134.99
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+ 1 more
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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.