• $0 - $50+


Seachem

(43 results)
Seachem® Prime® Aquarium Water Conditioner
4 sizes
(369)
$3.79 - $16.69
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 2 more
Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(198)
$3.99 - $8.39
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 2 more
Seachem® Purigen® Premium Synthetic Absorbent
2 sizes
(54)
$9.19 - $15.79
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 3 more
Seachem® Prime®
2 sizes
(7)
$52.19 - $88.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Matrix™
3 sizes
(20)
$4.49 - $35.09
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 3 more
Seachem® CupriSorb™ - Copper & Heavy Metal Absorbent
(0)
$6.07
$14.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
Seachem® Flourish Excel™
(10)
$7.89
$11.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 2 more
Seachem® Clarity™
(16)
$8.69
$14.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 2 more
Seachem® Purigen®
(10)
$57.19
$115.31
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Stability®
2 sizes
(8)
$48.19 - $77.09
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Strontium™
(0)
$7.03
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Iodide™
2 sizes
(0)
$8.39 - $10.19
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Advantage Magnesium™
2 sizes
(0)
$6.09 - $17.39
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Plus™
2 sizes
(0)
$7.29 - $10.69
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Buffer™
2 sizes
(0)
$7.19 - $21.00
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Fusion 2™
2 sizes
(0)
$8.59 - $20.19
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Fusion 1™
2 sizes
(0)
$8.59 - $12.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Status Calcium Kit
(0)
$34.49
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Carbonate™
2 sizes
(0)
$5.39 - $6.89
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
SeaChem Reef Complete Marine Care
(0)
$7.09
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® PhosGuard™
(3)
$4.89
$7.69
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 3 more
Seachem® Matrix Carbon™
(0)
$6.09
$9.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
Seachem® The Bag ™ Welded Filter
(4)
$5.27
$10.19
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
Seachem Flourish Potassium™
(6)
$9.49
$11.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 2 more
Seachem® Flourish Excel™
2 sizes
(2)
$36.19 - $66.70
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Flourish®
(4)
$39.89
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Phosguard™
2 sizes
(4)
$32.30 - $60.39
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Cichlid Lake Salt™
(0)
$23.89
$41.06
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Tidal™ 75 Zeolite Filter Pouch
(0)
$8.19
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 2 more
Seachem® Tidal™ 110 MatrixCarbon
(0)
$20.44
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 2 more
Seachem® Tidal™ 75 Matrix Carbon
(0)
$10.19
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 2 more
Seachem® Tidal Matrix™
(0)
$7.69
$12.29
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Sign In & Enjoy Free Shipping Over $49
Seachem® Tidal Matrix™
(2)
$7.69
$11.29
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Sign In & Enjoy Free Shipping Over $49
Seachem® Tidal ™
(0)
$8.39
$16.88
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 2 more
Seachem® Tidal ™
(0)
$6.99
$10.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 2 more
Seachem® Tidal ™
(0)
$9.99
$11.69
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 2 more
Seachem® Marine Buffer™
(0)
$23.19
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Reef Complete™
(0)
$10.59
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 1 more
Seachem® Tidal™ Zeolite
(0)
$12.99
$14.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
BOGO 50% Off All Aquatic Media
+ 2 more
Seachem® Marine Buffer
(2)
$9.99
Earn 10,000 points PER DAY ($20 back in savings) when you spend $100+ on merchandise and services.
Save 35% On Your First Autoship Order!
+ 2 more
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Keep your fish feeling their best with the many different Seachem® aquarium products that are available at PetSmart. Whether you’re looking for water conditioners, plant substrates, stability systems, filters or more, we have what you need. Choosing the right supplies for your aquarium set-up can feel overwhelming with so many different options out there. When you choose Seachem products to create your fishes’ home, you can be confident in your decision. 
PetSmart’s selection of other brands and options of aquarium supplies includes:
You can find what you’re looking for to keep your fish living a happy and healthy life at PetSmart. Need other aquarium supplies while you’re here? We have you covered. 
PetSmart also offers convenient shopping with curbside or in-store pickup. Need something today? We have select items available for same-day delivery in most areas powered by DoorDash. For items you purchase frequently, PetSmart has Autoship that automatically delivers the items you want to your door as often as you’d like. Check the website to see what items are eligible.