Deals on fish & aquariums

Build your most beautiful underwater ecosystem yet

Marine & Freshwater

(82 results)
API® Freshwater Aquarium Master Test Kit
(293)
$35.99
$39.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® E.M. Erythromycin Fish Bacterial Infection Treatment
(73)
$17.89
$26.49
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(357)
$2.29 - $37.58
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Aquarium Salt
3 sizes
(185)
$8.99 - $112.49
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Quick Start Aquarium Cycling Water Conditioner
3 sizes
(144)
$8.99 - $17.39
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Guide Fish Problem Solving General Cure
(60)
$16.39
$23.49
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Turtle Sludge Destroyer 8 Oz
(20)
$8.69
$9.19
Save 35% On Your First Autoship Order!
Spend $250 on reptile terrariums and supplies earn 25,000 points ($50 back in savings)
+ 2 more
API® Liquid Super Ick Cure
(155)
$6.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® ACCU Clear Aquarium Water Clairifier
2 sizes
(297)
$5.59 - $9.49
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Melafix Fish Bacterial Infection Treatment
(190)
$14.39
$16.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® FIN & BODY CURE POWDER
(64)
$16.39
$17.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® 5 in 1 Aquarium Test Strips
3 sizes
(143)
$6.99 - $24.98
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Saltwater Aquarium Master Test Kit
(8)
$35.98
$35.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Bottom Feeder Premium Shrimp Pellets Fish Food
2 sizes
(67)
$3.89 - $9.98
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Bettafix Freshwater Fish Bacterial Infection Treatment
(130)
$4.58
$4.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Leaf Zone Aquarium Plant Fertilizer
(62)
$8.19 - $13.49
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Amonia Test Kit
(10)
$15.49
$16.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Melafix Fish Bacterial Infection Treatment
(2)
$9.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Stress Zyme Aquarium Water Conditioner
3 sizes
(89)
$10.58 - $59.98
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Algae Wafers
(10)
$3.49
$5.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Reef Aquarium Water Test Kit
(0)
$35.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Aqua Essential
2 sizes
(70)
$8.69 - $15.88
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Pond Algefix
2 sizes
(0)
$68.98 - $139.98
Save 35% On Your First Autoship Order!
Sign In & Enjoy Free Shipping Over $49
API® Turtle Water Conditioner
(8)
$8.69
$9.19
Save 35% On Your First Autoship Order!
Spend $250 on reptile terrariums and supplies earn 25,000 points ($50 back in savings)
+ 2 more
API® Tropical Community Fish Flakes
2 sizes
(100)
$4.99 - $13.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Goldfish Premium Pellets Fish Food
(34)
$11.98
$11.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® CO2 Booster Freshwater Aquarium Plant Supplement
(44)
$10.59 - $14.69
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Algaefix Aquarium Algae Control
3 sizes
(251)
$9.48 - $16.98
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® pH Up Adjuster Freshwater Aquarium Water Conditioner
(22)
$7.09
$8.49
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Pimafix Fish Fungal Infection Treatment
2 sizes
(94)
$9.09 - $12.09
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Tap Water Conditioner Super Strength Aquarium Dechlorinator
3 sizes
(40)
$4.79 - $48.29
Save 35% On Your First Autoship Order!
Sign In & Enjoy Free Shipping Over $49
API® Pimafix Fish Fungal Infection Treatment
(0)
$8.49
$9.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Pond Algaefix Algae Control 64 Oz
(0)
$41.99
$58.99
Save 35% On Your First Autoship Order!
Sign In & Enjoy Free Shipping Over $49
API Tropical Flake
(4)
$3.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Chlorine & Heavy Metal Neutralizer Pond water Conditioner
(0)
$27.69
$33.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Pond Aqua Essential
(0)
$16.99
$23.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Accu-Clear Clarifier Pond Water Conditioner
4 sizes
(2)
$13.49 - $65.98
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Bottom Feeder Premium Squid Pellets
(6)
$5.99
$9.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Stress Zyme Water Conditioner
(12)
$5.89
$6.49
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Cichlid Pellets
(0)
$7.49
$7.99
Save 35% On Your First Autoship Order!
Free Same-Day Delivery, No Order Minimum!
+ 1 more
  1. 1
  2. 2
  3. 3

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.