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Marine & Freshwater

(396 results)
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4272)
$34.99 - $143.99
Save 50% on Top Fin Essential Starter Kits 10 Gallons & Below!
Save 20% on Select Essential Starter Kits!
+ 1 more
Top Fin® Large Power Filter Cartridges
(281)
$17.99
BOGO 50% Select Aquatic Filter Media
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Fascinate Column Starter Kit
(314)
$44.99
$89.99
Save 50% on Top Fin Essential Starter Kits 10 Gallons & Below!
Save 20% on Select Essential Starter Kits!
+ 1 more
Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(234)
$8.99 - $17.99
BOGO 50% Select Aquatic Filter Media
Save 35% On Your First Autoship Order!
+ 2 more
Top Fin® Compact Aquarium Heater
3 sizes
(489)
$14.59 - $33.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® 36 Gallon Aquarium & Stand Ensemble Combo
(72)
$249.99
$399.99
Save $150 on our 36 Gallon Ensemble!
Top Fin® Bow Front Aquarium Starter Kit -  36 Gallon
(474)
$116.99
$194.99
Save 40% on Top Fin Essential Starter Kits 20 Gallons and above!
Save 20% on Select Essential Starter Kits!
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Top Fin® Captivate Starter Kit
(416)
$80.99
$134.99
Save 40% on Top Fin Essential Starter Kits 20 Gallons and above!
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Top Fin® Mystic Oak Finish Aquarium Stand
3 sizes
(40)
$59.99 - $89.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1513)
$18.99 - $49.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Corner Tank Aquarium Starter Kit - 6 Gallon
(354)
$39.99
$79.99
Save 50% on Top Fin Essential Starter Kits 10 Gallons & Below!
Free Same-Day Delivery, No Order Minimum!
Top Fin® Element EF-S Filter Cartridges
3 sizes
(373)
$8.99 - $17.99
BOGO 50% Select Aquatic Filter Media
Save 35% On Your First Autoship Order!
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Top Fin® Aquarium Hinged Glass Lid
7 sizes
(220)
$16.99 - $58.99
Buy Any Open Glass Get 20% off Top Fin Glass Hood
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Half Moon Aquarium - 3.5 Gallon
(2072)
$39.99
$44.99
Half Moon Betta Aquarium only $39.99!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Silenstream™ Small Filter Cartridges
(65)
$14.99
SAVE 40% on your first Autoship order (max $20 savings) thru 12/14*
BOGO 50% Select Aquatic Filter Media
+ 2 more
Top Fin® Premium Aquarium Gravel - Classic Beach
(66)
$7.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Aquarium Gravel Vacuum
4 sizes
(814)
$9.99 - $21.99
Earn 3X points (6% back in savings) on all aquatic cleaning and aeration supplies!
Save 35% On Your First Autoship Order!
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Top Fin® Premium Aquarium Gravel - Caribbean Sea Mix
2 sizes
(47)
$7.99 - $25.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Aquarium Sponge Filter
3 sizes
(206)
$9.99 - $19.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Silenstream Filter Cartridge - 3pk
(111)
$8.99
SAVE 40% on your first Autoship order (max $20 savings) thru 12/14*
BOGO 50% Select Aquatic Filter Media
+ 2 more
Top Fin® Aquarium Air Pump
3 sizes
(769)
$17.39 - $20.79
Earn 3X points (6% back in savings) on all aquatic cleaning and aeration supplies!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Aquarium Airline Tubing
2 sizes
(98)
$4.99 - $7.69
Earn 3X points (6% back in savings) on all aquatic cleaning and aeration supplies!
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Premium Aquarium Gravel - Black & Neon
3 sizes
(58)
$4.99 - $25.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Aquarium Water Conditioner
3 sizes
(247)
$4.19 - $9.99
SAVE 40% on your first Autoship order (max $20 savings) thru 12/14*
Buy 1 Get The 2nd 25% off on API & Top Fin Food & Watercare!
+ 2 more
Top Fin® Artificial Realistic Leaf Aquarium Plant - 4"
(36)
$4.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Artificial Striped Leaf Aquarium Plant - 8"
(54)
$5.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Fine Mesh Fish Net
(114)
$1.49
$2.49
Earn 3X points (6% back in savings) on all aquatic cleaning and aeration supplies!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Aquarium Stand - 55 to 75 Gallon
(267)
$254.99
$299.99
Save 15% on Select Top Fin Aquarium Stands!
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Top Fin® Aquarium Stand - 20 to 37 Gallon
(126)
$152.99
$179.99
Save 15% on Select Top Fin Aquarium Stands!
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Top Fin® Aquarium Stand - 55 to 75 Gallon
(141)
$254.99
$299.99
Save 15% on Select Top Fin Aquarium Stands!
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Top Fin® Aquarium Stand - 20 to 37 Gallon
(139)
$152.99
$179.99
Save 15% on Select Top Fin Aquarium Stands!
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Top Fin® 10 Gallon Angled Aquarium
(149)
$89.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® 5 Gallon Shrimp & Plant Aquarium
(89)
$69.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® LED Bubble Wall Aquarium Kit
2 sizes
(842)
$89.99 - $134.99
Free Same-Day Delivery, No Order Minimum!
Top Fin® Shrimp & Plant Oasis Tank - 3 Gallon
(286)
$54.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Custom Colorflow™ Aquarium with 7 Color-Changing LEDs
2 sizes
(1385)
$48.07 - $69.99
Free Same-Day Delivery, No Order Minimum!
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Top Fin® Retreat™ RF-L Filter Cartridges
(109)
$14.99
SAVE 40% on your first Autoship order (max $20 savings) thru 12/14*
BOGO 50% Select Aquatic Filter Media
+ 2 more
Top Fin® Stone & Coral Bubbler Aquarium Ornament
(289)
$59.99
B2G1 Free Aquatic Ornaments excluding Glofish
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Ship Aquarium Ornament
(79)
$109.99
B2G1 Free Aquatic Ornaments excluding Glofish
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Premium Glass Aquarium - 5 Gallon
(1570)
$69.99
Free Same-Day Delivery, No Order Minimum!
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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.