Thinking about new fish?

Dive into all you need for happy aquatic life

Marine & Freshwater

(1126 results)
Top Fin® Essentials Aquarium Starter Kit
8 sizes
(4321)
$34.99 - $191.99
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
Save 50% on Essential Starter Kits 10 Gallons & Below!
Aqueon Standard Glass Rectangle Aquarium
7 sizes
(310)
$12.49 - $132.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Open Glass Tank, Get 20% off Top Fin Hoods & Lights!!
+ 2 more
Fluval® Plant Stratum Aquarium Substrate
(125)
$18.79
$28.99
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
Sign In & Enjoy Free Shipping Over $49
Top Fin® Large Power Filter Cartridges
(281)
$17.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Online Only! Buy 3 Get the 4th FREE on Aquatic Media!
+ 2 more
Top Fin® Fascinate Column Starter Kit
(332)
$44.99
$89.99
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
Save 50% on Essential Starter Kits 10 Gallons & Below!
+ 1 more
Top Fin® Compact Aquarium Heater
3 sizes
(495)
$14.59 - $33.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Premium Aquarium Gravel - Classic Beach
(66)
$7.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Seachem® Prime® Aquarium Water Conditioner
4 sizes
(369)
$3.79 - $16.69
Save 15% when you spend $50+ on FREE Same-Day Delivery
Save 35% On Your First Autoship Order!
+ 2 more
Marineland® High Definition LED Ensemble - 75 Gallon
(582)
$499.99
$799.99
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
SAVE $300 on Marineland® High Definition LED Ensemble - 75 Gallon!
Top Fin® 36 Gallon Aquarium & Stand Ensemble Combo
(82)
$249.99
$399.99
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
Save $150 on our 36 Gallon Ensemble!
Fluval Plant & Shrimp Stratum
(8)
$36.99
$49.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Top Fin® Bow Front Aquarium Starter Kit -  36 Gallon
(476)
$155.99
$194.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Marineland Open Glass Aquarium
3 sizes
(182)
$29.99 - $209.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Open Glass Tank, Get 20% off Top Fin Hoods & Lights!!
+ 3 more
API® Freshwater Aquarium Master Test Kit
(297)
$35.99
$39.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy 1 Get the 2nd for 25% Off on API Food & Watercare!
+ 3 more
CaribSea Super Naturals Aquarium Sand - Moonlight White
(102)
$19.99
$29.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
CaribSea Super Naturals Aquarium Sand - White
(25)
$19.99
$27.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Fluval AC Power Filter
4 sizes
(119)
$42.99 - $99.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® PF-S Silenstream Aquarium Filter Cartridges
2 sizes
(234)
$8.99 - $17.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Online Only! Buy 3 Get the 4th FREE on Aquatic Media!
+ 3 more
Aqua Natural Aquarium Sand - Galaxy Black
2 sizes
(97)
$14.99 - $25.19
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Nature's Ocean Live Nutri-Seawater
(28)
$22.99
$25.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Save 35% On Your First Autoship Order!
+ 2 more
Top Fin® Aquarium Hinged Glass Lid
7 sizes
(245)
$16.99 - $58.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Open Glass Tank, Get 20% off Top Fin Hoods & Lights!!
+ 2 more
CaribSea Super Naturals Premium Aquarium Substrate
(59)
$19.99
$29.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Top Fin® Silenstream™ Small Filter Cartridges
(65)
$14.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Online Only! Buy 3 Get the 4th FREE on Aquatic Media!
+ 3 more
Activ-Flora Floracor Black Planted Aquarium Substrate
(20)
$24.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
CaribSea Aragonite Aragamax Select Substrate
(38)
$8.89
$16.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Top Fin® Element EF-S Filter Cartridges
3 sizes
(380)
$8.99 - $17.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Online Only! Buy 3 Get the 4th FREE on Aquatic Media!
+ 3 more
Omega™One Frozen Blood Worms Fish Food
(208)
$8.99
$9.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy 1 Get the 2nd for 25% OFF All Frozen Fish Food!
+ 1 more
Aqua Natural Aquarium Sand - White
(71)
$14.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 more
Zoo Med Mopani Wood Aquarium Ornament
4 sizes
(189)
$4.09 - $54.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy 2 Get the 3rd for FREE on Aquatic Ornaments! (excluding GloFish)
+ 2 more
Top Fin® Silenstream™ Aquarium Power Filter
5 sizes
(1533)
$18.99 - $49.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® E.M. Erythromycin Fish Bacterial Infection Treatment
(75)
$21.98
$26.49
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy 1 Get the 2nd for 25% Off on API Food & Watercare!
+ 3 more
Top Fin® Battery Operated Aquarium Air Pump
(120)
$17.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Aquarium Gravel Vacuum
4 sizes
(820)
$9.99 - $21.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Omega™ One Frozen Brine Shrimp Fish Food
(94)
$6.99
$7.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy 1 Get the 2nd for 25% OFF All Frozen Fish Food!
+ 1 more
Seachem® Purigen® Premium Synthetic Absorbent
2 sizes
(56)
$9.19 - $15.79
Save 15% when you spend $50+ on FREE Same-Day Delivery
Online Only! Buy 3 Get the 4th FREE on Aquatic Media!
+ 3 more
Omega™One Frozen Bloodworms
(188)
$9.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy 1 Get the 2nd for 25% OFF All Frozen Fish Food!
+ 1 more
Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(198)
$3.99 - $8.39
Save 15% when you spend $50+ on FREE Same-Day Delivery
Save 35% On Your First Autoship Order!
+ 2 more
API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(363)
$2.29 - $37.58
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy 1 Get the 2nd for 25% Off on API Food & Watercare!
+ 3 more
Top Fin® Aquarium Air Pump
3 sizes
(775)
$17.39 - $20.79
Save 15% when you spend $50+ on FREE Same-Day Delivery
Free Same-Day Delivery, No Order Minimum!
+ 1 more
Top Fin® Premium Aquarium Gravel - Black & Neon
3 sizes
(58)
$4.99 - $25.99
Save 15% when you spend $50+ on FREE Same-Day Delivery
Buy Any Tank & Save 20% OFF All Substrate, Sand & Gravel! (excludes gems)
+ 2 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.