Deals on fish & aquariums

Build your most beautiful underwater ecosystem yet

Marine & Freshwater

(1192 results)
Aqueon Standard Glass Rectangle Aquarium
6 sizes
(257)
$11.49 - $94.99
Buy any open glass tank, Get 20% off a glass hood
Free Same-Day Delivery, No Order Minimum!
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4168)
$55.99 - $191.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Large Power Filter Cartridges
(273)
$17.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Seachem® Prime® Aquarium Water Conditioner
4 sizes
(359)
$3.79 - $16.69
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Fluval® FX6 Aquarium Canister Filter
(200)
$369.99
$419.99
Free Same-Day Delivery, No Order Minimum!
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Marineland Open Glass Aquarium
3 sizes
(134)
$14.99 - $149.99
Buy any open glass tank, Get 20% off a glass hood
Fluval® 407 Performance Aquarium Canister Filter
(118)
$229.99
$269.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Bow Front Aquarium Starter Kit -  36 Gallon
(461)
$155.99
$194.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Silenstream™ Small Filter Cartridges
(63)
$14.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Save 35% On Your First Autoship Order!
+ 3 more
Top Fin® Fascinate Column Starter Kit
(302)
$71.99
$89.99
Free Same-Day Delivery, No Order Minimum!
API® Freshwater Aquarium Master Test Kit
(293)
$35.99
$39.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Instant Ocean® Sea Salt
2 sizes
(83)
$21.19 - $51.59
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Fluval® Plant Stratum Aquarium Substrate
(119)
$23.69
$28.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 1 more
Fluval Aquaclear Aquarium Power Filter
4 sizes
(94)
$42.99 - $97.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
CaribSea Super Naturals Aquarium Sand - Moonlight White
(96)
$19.99
$29.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Element EF-S Filter Cartridges
3 sizes
(365)
$8.99 - $17.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Save 35% On Your First Autoship Order!
+ 2 more
Fluval Plant & Shrimp Stratum
(8)
$46.49
$49.99
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(225)
$8.99 - $17.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Save 35% On Your First Autoship Order!
+ 2 more
Top Fin® Aquarium Hinged Glass Lid
7 sizes
(188)
$16.99 - $58.99
Buy any open glass tank, Get 20% off a glass hood
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Internal Filter Cartridges
(30)
$7.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Save 35% On Your First Autoship Order!
+ 3 more
Aqua Natural Aquarium Sand - Galaxy Black
2 sizes
(87)
$14.39 - $24.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
CaribSea Super Naturals Aquarium Sand - White
(22)
$19.99
$27.99
3X points (6% back in savings) on all aquatic gravel
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Compact Aquarium Heater
3 sizes
(467)
$14.59 - $33.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Top Fin® Premium Aquarium Gravel - Classic Beach
(64)
$7.99
3X points (6% back in savings) on all aquatic gravel
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1481)
$12.99 - $49.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
API® E.M. Erythromycin Fish Bacterial Infection Treatment
(73)
$17.89
$26.49
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Omega™One Frozen Blood Worms Fish Food
(202)
$8.99
$9.99
Buy 1 Get the 2nd 25% off All Frozen Fish Food
Free Same-Day Delivery, No Order Minimum!
API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(357)
$2.29 - $37.59
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(45)
$7.99 - $25.99
3X points (6% back in savings) on all aquatic gravel
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Omega™One Frozen Bloodworms
(178)
$9.99
Buy 1 Get the 2nd 25% off All Frozen Fish Food
Free Same-Day Delivery, No Order Minimum!
Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(190)
$3.99 - $8.39
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Aqua Natural Aquarium Sand - White
(62)
$14.39
$14.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
API® Quick Start Aquarium Cycling Water Conditioner
3 sizes
(144)
$8.99 - $17.39
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
GloFish® Aquarium Gravel
1 size 4 colors
(126)
$4.09
$6.99
3X points (6% back in savings) on all aquatic gravel
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Silenstream Filter Cartridge - 3pk
(111)
$8.99
Buy 1 Get the 2nd 50% Top Fin, Tetra & Seachem Media
Save 35% On Your First Autoship Order!
+ 3 more
Omega™ One Frozen Brine Shrimp Fish Food
(90)
$6.99
$7.99
Buy 1 Get the 2nd 25% off All Frozen Fish Food
Free Same-Day Delivery, No Order Minimum!
Top Fin® Aquarium Sponge Filter
3 sizes
(200)
$9.99 - $19.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Tetra® TetraMin Tropical Flakes Fish Food
4 sizes
(367)
$3.89 - $47.89
Save 35% On Your First Autoship Order!
Earn a 5,000-point Reward Certificate when you get your second Autoship delivery by 11/30
+ 2 more
Zoo Med Mopani Wood Aquarium Ornament
4 sizes
(183)
$4.99 - $54.99
Buy 2 Get the 3rd Free Aquatic Ornaments (excludes Glofish)
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.