Dive into fish deals

Valid thru 5/31*

Marine & Freshwater

(45 results)
Marineland® High Definition LED Ensemble - 75 Gallon
(590)
$499.99
$799.99
Online Only! Save 20% on your purchase with code SAVE20
Marineland Open Glass Aquarium
3 sizes
(195)
$18.49 - $159.99
Buy Any Open Glass Tank, Get 20% OFF Top Fin Glass Hood - Online Only!
Save 50% on ALL Marineland® & Aqueon® open-glass aquariums thru 5/31
Marineland High-Definition LED Ensemble - 125G
(51)
$699.99
$999.99
$300 OFF Marineland High-Definition LED Ensemble - 125G
Marineland® Modern LED Aquarium & Stand Ensemble - 60 Gallon
(509)
$399.99
$649.99
Online Only! Save 20% on your purchase with code SAVE20
$250 OFF Marineland® Modern LED Aquarium & Stand Ensemble - 60 Gallon
Marineland Penguin PRO 375 Aquarium Power Filter
(148)
$64.87
$71.79
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Magniflow® 400 Aquarium Canister Filter
(200)
$216.27
$219.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Penguin Rite Size C Power Filter Cartridges
(84)
$19.97
$23.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Emperor® PRO 450 Aquarium Filter
(56)
$94.72
$99.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Magniflow® 250 Aquarium Canister Filter
(148)
$155.57
$169.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Black Diamond Carbon
(24)
$9.99
$24.99
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® Penguin PRO 275 Aquarium Power Filter
(164)
$51.27
$54.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Polishing Internal Filter
(53)
$92.82
$99.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Rite Size Emperor Power Filter Cartridge
(33)
$12.77
$15.59
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Silicone Aquarium Sealant
(59)
$8.99
Online Only! Save 20% on your purchase with code SAVE20
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland Magnum 200 Polishing Internal Canister Filter
(26)
$55.22
$69.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland Penguin PRO 125 Aquarium Power Filter
(128)
$33.92
$34.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland Penguin PRO 175 Aquarium Power Filter
(132)
$43.17
$44.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Visi-Therm Submersible Aquarium Heater
(254)
$32.97 - $41.49
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Hidden LED Lighting System
(58)
$49.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® Penguin Rite Size B Power Filter Cartridges
(36)
$17.57
$19.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Instant Ocean® Hold Fast Aquarium Bond Stick
(11)
$11.99
Online Only! Save 20% on your purchase with code SAVE20
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Penguin Rite Size C Power Filter Cartridges
(42)
$12.77
$15.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Magnum 200 Polishing Internal Filter Floss Sleeve
(0)
$4.79
$4.99
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® 2-in-1 Bio-Foam & Pre-Filter - Fits 375 to 450
(28)
$5.79
$6.99
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® 2-in-1 Bio-Foam & Pre-Filter - Fits 125 to 275
(26)
$5.29
$7.59
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® Maxi-Jet® 1200 Aquarium Water Pump and Power Head
(21)
$19.79
$39.99
Sign In & Enjoy Free Shipping Over $49
Marineland®  LED Aquarium Light Bar
(125)
$46.99
Free Same-Day Delivery, No Order Minimum!
Sign In & Enjoy Free Shipping Over $49
Marineland® C360 Polishing Filter Pads
(3)
$6.49
$7.79
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® C160/220 Polishing Filter Pads
(8)
$3.99
$5.09
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® C360 Filter Foam
(2)
$3.93
$12.99
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® Bio-Filter Balls
(4)
$3.39
$4.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® Filter Foam
(2)
$2.89
$8.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® Ceramic Rings
(4)
$5.79
$6.29
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® Carbon Filter Bags
(14)
$8.09
$12.99
Online Only! Save 20% on your purchase with code SAVE20
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
+ 2 more
Marineland® Penguin 100B Bio-Wheel Assembly
(12)
$9.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® Penguin 150B Bio-Wheel Assembly
(2)
$15.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® Penguin 200B/350B Bio-Wheel Assembly
(12)
$9.29
$14.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® Bio-Wheel Assembly
(4)
$16.99
$19.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® Black Diamond Carbon
(2)
$22.69
$26.99
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $49
Marineland® White Diamond Carbon
(4)
$4.69
Buy 3, Get the 4th FREE on All Aquatic Media - Online Only!
Sign In & Enjoy Free Shipping Over $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.