Marine & Freshwater

(1158 results)
Aqueon Standard Glass Rectangle Aquarium
7 sizes
(287)
$12.49 - $94.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4237)
$34.99 - $191.99
Save 50% on 10 Gallon and Under Top Fin Essential Starter Kits!
Free Same-Day Delivery, No Order Minimum!
Top Fin® Large Power Filter Cartridges
(279)
$17.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland Open Glass Aquarium
3 sizes
(166)
$17.59 - $149.99
Free Same-Day Delivery, No Order Minimum!
Fluval® FX6 Aquarium Canister Filter
(200)
$369.99
$419.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® 36 Gallon Aquarium & Stand Ensemble Combo
(70)
$299.99
$449.99
$150 Off Top Fin 36 Gallon Ensembles!
Fluval® 407 Performance Aquarium Canister Filter
(124)
$229.99
$269.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Fascinate Column Starter Kit
(310)
$44.99
$89.99
Save 50% on 10 Gallon and Under Top Fin Essential Starter Kits!
Free Same-Day Delivery, No Order Minimum!
Fluval® Plant Stratum Aquarium Substrate
(121)
$23.69
$28.99
Extra 20% off online only with code SAVE20, see terms
Sign In & Enjoy Free Shipping Over $49
API® Freshwater Aquarium Master Test Kit
(293)
$35.99
$39.99
Extra 20% off online only with code SAVE20, see terms
BOGO 25% all API Food & Watercare
+ 3 more
Top Fin® Mystic Oak Finish Aquarium Stand
3 sizes
(44)
$59.99 - $89.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
CaribSea Super Naturals Aquarium Sand - Moonlight White
(102)
$19.99
$29.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Fluval Plant & Shrimp Stratum
(8)
$46.49
$49.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Fluval AC Power Filter
4 sizes
(103)
$42.99 - $99.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Half Moon Aquarium - 3.5 Gallon
(2072)
$39.99
$44.99
Extra 20% off online only with code SAVE20, see terms
Half Moon Betta Aquarium only $39.99!
+ 2 more
Top Fin® Aquarium Hinged Glass Lid
7 sizes
(212)
$16.99 - $58.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Compact Aquarium Heater
3 sizes
(481)
$14.59 - $33.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Aqua Natural Aquarium Sand - Galaxy Black
2 sizes
(91)
$14.39 - $24.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Silenstream™ Small Filter Cartridges
(65)
$14.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
CaribSea Super Naturals Aquarium Sand - White
(22)
$19.99
$27.99
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Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(234)
$8.99 - $17.99
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BOGO 50% Off All Aquatic Media
+ 3 more
Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1499)
$18.99 - $49.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Seachem® Prime® Aquarium Water Conditioner
4 sizes
(369)
$3.79 - $16.69
Extra 20% off online only with code SAVE20, see terms
Save 35% On Your First Autoship Order!
+ 2 more
Top Fin® Element EF-S Filter Cartridges
3 sizes
(369)
$8.99 - $17.99
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BOGO 50% Off All Aquatic Media
+ 3 more
Top Fin® Premium Aquarium Gravel - Classic Beach
(66)
$7.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Omega™One Frozen Blood Worms Fish Food
(204)
$10.79
Extra 20% off online only with code SAVE20, see terms
BOGO 25% OFF All Frozen Fish Food
+ 1 more
API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(361)
$2.29 - $37.58
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BOGO 25% all API Food & Watercare
+ 3 more
Aqua Natural Aquarium Substrate - Gold Pearl
(17)
$5.59
$14.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Silenstream Filter Cartridge - 3pk
(111)
$8.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Omega™One Frozen Bloodworms
(186)
$9.99
Extra 20% off online only with code SAVE20, see terms
BOGO 25% OFF All Frozen Fish Food
+ 1 more
Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(198)
$3.99 - $8.39
Extra 20% off online only with code SAVE20, see terms
Save 35% On Your First Autoship Order!
+ 2 more
Top Fin® Aquarium Airline Tubing
2 sizes
(96)
$4.99 - $7.69
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Omega™ One Frozen Brine Shrimp Fish Food
(90)
$6.99
$7.99
Extra 20% off online only with code SAVE20, see terms
BOGO 25% OFF All Frozen Fish Food
+ 1 more
Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(47)
$7.99 - $25.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Aquarium Salt
3 sizes
(185)
$8.99 - $112.49
Extra 20% off online only with code SAVE20, see terms
BOGO 25% all API Food & Watercare
+ 3 more
Zoo Med Mopani Wood Aquarium Ornament
4 sizes
(185)
$4.99 - $54.99
Extra 20% off online only with code SAVE20, see terms
B2G1 more Free Aquatic Ornaments excluding Glofish
+ 3 more
Top Fin® Fine Mesh Fish Net
(110)
$1.49
$2.49
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® High Definition LED Ensemble - 75 Gallon
(570)
$549.99
$849.99
$300 Off Select 75 & 125 Gallon Ensembles!
Marineland High-Definition LED Ensemble - 125G
(28)
$699.99
$999.99
$300 Off Select 75 & 125 Gallon Ensembles!
Fluval FX2 Aquarium Canister Filter
(36)
$269.99
$319.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 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.