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Seachem

(38 results)
Seachem® Prime® Aquarium Water Conditioner Chlorine & Ammonia Detoxifier
4 sizes
(385)
$3.19
$6.99
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+ 2 more
Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(214)
$5.49
$4.99
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Seachem® Purigen® Premium Synthetic Absorbent - Aquarium Filter Media
2 sizes
(68)
$9.89
$12.99
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Seachem® Prime® Chlorine & Ammonia Detoxifier
2 sizes
(11)
$52.99
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Seachem® Stability® for Aquarium Cycling
2 sizes
(8)
$48.11
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Seachem® Flourish Excel™ for Live Aquarium Plants
2 sizes
(14)
$10.79
$17.99
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Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
Seachem® Matrix™ - Aquarium Filter Media
3 sizes
(20)
$8.79
$7.99
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Seachem® Flourish Potassium™ for Live Aquarium Plants
(6)
$11.39
$11.89
Save 40% On First Autoship Order of Aquatic Watercare
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Seachem® Purigen® Aquarium Water Treatment
(10)
$57.19
$115.31
Save 40% On First Autoship Order of Aquatic Watercare
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
Seachem® Flourish® Freshwater Aquarium Comprehensive Plant Supplement
2 sizes
(55)
$8.79
$7.99
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Seachem® Alert Combo™ Aquarium pH & Ammonia Detector for Aquarium Water Testing
(80)
$9.54
$18.99
Save 40% On First Autoship Order of Aquatic Watercare
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Seachem® Reef Strontium™ for Reef Aquarium Water Care
(0)
$7.03
Save 40% On First Autoship Order of Aquatic Watercare
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+ 1 more
Seachem® Reef Iodide™ for Reef Aquarium Water Care
2 sizes
(0)
$11.29
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Seachem® Reef Advantage Magnesium™ for Reef Aquarium Water Care
2 sizes
(0)
$6.09
$11.99
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Seachem® Reef Plus™ for Reef Aquarium Water Care
2 sizes
(0)
$7.24
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Seachem® Reef Buffer™ for Reef Aquarium Water Care
2 sizes
(0)
$11.99
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Seachem® Reef Fusion 2™ for Reef Aquarium Water Care
2 sizes
(0)
$11.99
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Seachem® Reef Fusion 1™ for Reef Aquarium Water Care
2 sizes
(0)
$11.99
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Seachem® Reef Status Calcium Kit for Reef Aquarium Water Care
(0)
$34.22
Save 40% On First Autoship Order of Aquatic Watercare
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Seachem® Reef Carbonate™ for Reef Aquarium Water Care
2 sizes
(0)
$9.19
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SeaChem Reef Complete Marine Care for Reef Aquarium Water Care
(0)
$7.03
Save 40% On First Autoship Order of Aquatic Watercare
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+ 1 more
Seachem® Clarity™ for Saltwater Aquariums
(18)
$5.99
$14.99
Save 40% On First Autoship Order of Aquatic Watercare
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+ 2 more
Seachem® Flourish® for Live Aquarium Plants
(4)
$36.14
$72.86
Save 40% On First Autoship Order of Aquatic Watercare
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
Seachem® Phosguard™ Aquarium Water Treatment
2 sizes
(7)
$32.30
$65.10
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Seachem® Cichlid Lake Salt™ for Freshwater Fish Tanks
(0)
$27.79
$31.99
Save 40% On First Autoship Order of Aquatic Watercare
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+ 1 more
Seachem® Tidal™ 75 Zeolite Filter Pouch - Aquarium Media
(0)
$14.69
Save 40% On First Autoship Order of Aquatic Filter Media
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+ 1 more
Seachem® Tidal™ 110 MatrixCarbon - Aquarium Filter Media
(0)
$19.99
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+ 1 more
Seachem® Tidal™ 75 Matrix Carbon - Aquarium Filter Media
(0)
$10.13
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+ 1 more
Seachem® Tidal Matrix™ - Internal Fish Tank Filter
(0)
$7.63
Buy Any Aquatic Filter and Get 20% Off All Aquatic Media
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Seachem® Tidal Matrix™ - Internal Fish Tank Filter
(2)
$6.98
$7.69
Buy Any Aquatic Filter and Get 20% Off All Aquatic Media
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Seachem® Tidal ™ - Replacement Aquarium Filter Media for Fish Tanks
(0)
$11.99
Save 40% On First Autoship Order of Aquatic Filter Media
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+ 1 more
Seachem® Tidal ™ - Replacement Aquarium Filter Media for Fish Tanks
(0)
$10.99
Save 40% On First Autoship Order of Aquatic Filter Media
Buy Any Aquatic Filter and Get 20% Off All Aquatic Media
+ 1 more
Seachem® Tidal ™ - Replacement Aquarium Filter Media for Fish Tanks
(0)
$9.49
Save 40% On First Autoship Order of Aquatic Filter Media
Buy Any Aquatic Filter and Get 20% Off All Aquatic Media
+ 1 more
Seachem® Marine Buffer™ for Reef Aquarium Water Care
(0)
$27.59
Save 40% On First Autoship Order of Aquatic Watercare
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
Seachem® Reef Complete™ Aquarium Water Treatment
(0)
$10.27
$20.70
Save 40% On First Autoship Order of Aquatic Watercare
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
Seachem® Tidal™ Zeolite - Aquarium Filter Media
(0)
$16.39
Save 40% On First Autoship Order of Aquatic Filter Media
Buy Any Aquatic Filter and Get 20% Off All Aquatic Media
+ 1 more
Seachem® Marine Buffer
(2)
$10.99
$9.99
Save 40% On First Autoship Order of Aquatic Watercare
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 2 more
Seachem® Neutral Regulator Aquarium pH Water Conditioner for Aquarium pH Control
(6)
$12.99
Save 40% On First Autoship Order of Aquatic Watercare
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
  1. 1
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.