April fish deals

Swim into savings on aquarium starter kits & aquatic media thru 5/3*

Marine & Freshwater

(47 results)
API® Freshwater Aquarium Master Test Kit
(401)
$35.98
$39.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Stress Coat Tap Water Aquarium Conditioner
6 sizes
(486)
$2.28 - $37.58
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Quick Start Aquarium Cycling Water Conditioner
3 sizes
(256)
$8.68 - $17.38
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Liquid Super Ick Cure
(160)
$6.98
$6.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Aquarium Salt
3 sizes
(193)
$8.78 - $112.48
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Guide Fish Problem Solving General Cure
(62)
$16.38
$23.49
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® FIN & BODY CURE POWDER
(68)
$16.38
$17.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® ACCU Clear Aquarium Water Clairifier
2 sizes
(305)
$5.58 - $9.48
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Saltwater Aquarium Master Test Kit
(10)
$35.98
$35.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® 5 in 1 Aquarium Test Strips
3 sizes
(147)
$6.98 - $24.98
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Melafix Fish Bacterial Infection Treatment
(192)
$14.38
$16.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Leaf Zone Aquarium Plant Fertilizer
(64)
$8.18 - $12.28
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Reef Aquarium Water Test Kit
(0)
$35.98
$35.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Aqua Essential
2 sizes
(70)
$8.68 - $15.88
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Bottom Feeder Premium Squid Pellets
(10)
$5.98
$9.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Algae Wafers Fish Food
(14)
$3.48
$5.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Bottom Feeder Premium Shrimp Pellets Fish Food
2 sizes
(73)
$3.28 - $9.98
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Stress Zyme Aquarium Water Conditioner
3 sizes
(93)
$10.58 - $59.98
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API Stress Zyme Water Conditioner
(14)
$5.88
$6.49
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Tropical Mini Pellets Fish Food
(28)
$6.98
$7.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Tropical Community Fish Flakes Fish Food
2 sizes
(104)
$4.98 - $13.98
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® CO2 Booster Freshwater Aquarium Plant Supplement
(46)
$10.58 - $14.68
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Algaefix Aquarium Algae Control
3 sizes
(351)
$9.48 - $16.98
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® pH Down Adjuster Aquarium Water Conditioner
2 sizes
(26)
$5.88 - $15.98
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® pH Up Adjuster Freshwater Aquarium Water Conditioner
(22)
$7.08
$8.49
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Ammo Lock
(30)
$10.98
$10.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Proper pH 7.0 Aquarium Water pH Conditioner
(68)
$11.18
$11.49
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Freshwater Aquarium Mini pH Test Kit
(12)
$7.98
$7.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Nitra-Zorb Aquarium Filter Media
(16)
$17.58
$19.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Buy 1, get the 2nd 50% OFF Select aquatic media - Mix & Match
+ 1 more
API Tropical Flake Fish Food
(12)
$2.98
$3.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Algae Scraper
(0)
$9.19
Sign In & Enjoy Free Shipping Over $49
API® Phosphate Test Kit
(0)
$14.98
$20.98
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Sign In & Enjoy Free Shipping Over $49
API® Pimafix Fish Fungal Infection Treatment
2 sizes
(100)
$9.08 - $12.08
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Sign In & Enjoy Free Shipping Over $49
API® GH & KH Freshwater Aquarium Test Kit
(2)
$11.98
$16.78
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Sign In & Enjoy Free Shipping Over $49
API® Marine Quick Start
(12)
$19.98
$19.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Marine Stress Zyme
(5)
$15.48
$15.59
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Quick Start
(126)
$2.78
$4.49
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Marine Melafix
(4)
$12.48
$14.99
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 more
API® Marine Complete Trace
(2)
$12.98
$15.59
Get 40% OFF your 1st Autoship order, 20% OFF your 2nd & 10% OFF your 3rd. Place your first order by 4/16
Free Same-Day Delivery, No Order Minimum!
+ 1 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.