Marine & Freshwater

(45 results)
Marineland Open Glass Aquarium
3 sizes
(166)
$17.59 - $149.99
Free Same-Day Delivery, No Order Minimum!
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!
Marineland Penguin PRO 375 Aquarium Power Filter
(139)
$64.99
$71.79
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Modern LED Aquarium & Stand Ensemble - 60 Gallon
(509)
$449.99
$699.99
$250 Off 60 Gallon Marineland Ensemble!
Marineland® Penguin Rite Size C Power Filter Cartridges
(80)
$19.99
$23.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® Emperor® PRO 450 Aquarium Filter
(52)
$94.99
$104.79
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® C360 Aquarium Canister Filter
(197)
$219.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Magniflow C250 Aquarium Canister Filter - 55G
(146)
$159.99
$227.39
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Rite Size Emperor Power Filter Cartridge
(32)
$13.19
$15.59
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® Black Diamond Carbon
(22)
$9.99
$24.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® Penguin PRO 275 Aquarium Power Filter
(157)
$54.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland®  LED Aquarium Light Bar
(125)
$33.49
$46.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Silicone Aquarium Sealant
(56)
$5.39
$7.19
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland Penguin PRO 175 Aquarium Power Filter
(125)
$44.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Polishing Internal Filter
(49)
$92.99
$102.69
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Visi-Therm Submersible Aquarium Heater
(239)
$34.99 - $41.49
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Hidden LED Lighting System
(58)
$49.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Carbon Filter Bags
(12)
$8.59
$12.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® Penguin Rite Size B Power Filter Cartridges
(32)
$17.59
$19.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland Magnum 200 Polishing Internal Canister Filter
(22)
$59.99
$69.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Magnum 200 Polishing Internal Filter Floss Sleeve
(0)
$4.79
$4.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland Penguin PRO 125 Aquarium Power Filter
(121)
$34.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® 2-in-1 Bio-Foam & Pre-Filter - Fits 375 to 450
(28)
$5.79
$6.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® 2-in-1 Bio-Foam & Pre-Filter - Fits 125 to 275
(24)
$6.29
$7.59
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® Maxi-Jet® 1200 Aquarium Water Pump and Power Head
(19)
$19.89
$39.99
Extra 20% off online only with code SAVE20, see terms
Sign In & Enjoy Free Shipping Over $49
Marineland® C360 Polishing Filter Pads
(3)
$6.49
$6.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® C160/220 Polishing Filter Pads
(8)
$3.99
$5.09
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® C360 Filter Foam
(2)
$3.57
$3.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 3 more
Marineland® Bio-Filter Balls
(4)
$4.99
$6.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® Filter Foam
(2)
$2.89
$8.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® Ceramic Rings
(4)
$5.79
$6.29
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® Penguin 100B Bio-Wheel Assembly
(12)
$9.79
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® Penguin 150B Bio-Wheel Assembly
(2)
$15.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® Penguin 200B/350B Bio-Wheel Assembly
(10)
$9.29
$11.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Instant Ocean® Hold Fast Aquarium Bond Stick
(11)
$11.99
Extra 20% off online only with code SAVE20, see terms
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Marineland® Bio-Wheel Assembly
(4)
$16.99
$19.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® Black Diamond Carbon
(2)
$22.69
$26.99
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® White Diamond Carbon
(4)
$6.19
$7.79
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
Marineland® Premium Carbon-Ammonia Neutralizing Blend
(10)
$11.79
Extra 20% off online only with code SAVE20, see terms
BOGO 50% Off All Aquatic Media
+ 2 more
  1. 1
  2. 2

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.