Marine & Freshwater

(41 results)
Seachem® Prime® Aquarium Water Conditioner
4 sizes
(357)
$3.79 - $16.69
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Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(188)
$3.99 - $8.39
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Seachem® Purigen® Premium Synthetic Absorbent
2 sizes
(46)
$9.99 - $14.99
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+ 3 more
Seachem® Prime®
2 sizes
(5)
$53.29 - $88.99
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+ 1 more
Seachem® Matrix™
3 sizes
(20)
$6.09 - $35.09
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+ 3 more
Seachem® Flourish Excel™
(8)
$9.29
$11.99
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Seachem® Stability®
2 sizes
(8)
$50.59 - $77.09
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+ 1 more
Seachem® Alert Combo™ Aquarium pH & Ammonia Detector
(74)
$15.49
$18.99
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Seachem® Reef Strontium™
(0)
$7.09
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+ 1 more
Seachem® Reef Iodide™
2 sizes
(0)
$8.39 - $10.19
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+ 1 more
Seachem® Reef Advantage Magnesium™
2 sizes
(0)
$6.09 - $20.99
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Seachem® Reef Plus™
2 sizes
(0)
$7.29 - $10.69
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Seachem® Reef Buffer™
2 sizes
(0)
$7.19 - $21.00
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+ 1 more
Seachem® Reef Fusion 2™
2 sizes
(0)
$8.50 - $17.49
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+ 1 more
Seachem® Reef Fusion 1™
2 sizes
(0)
$8.50 - $12.99
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+ 1 more
Seachem® Reef Status Calcium Kit
(0)
$34.49
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Seachem® Reef Carbonate™
2 sizes
(0)
$6.89 - $7.99
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+ 1 more
SeaChem Reef Complete Marine Care
(0)
$7.09
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+ 1 more
Seachem® PhosGuard™
(3)
$6.49
$7.69
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+ 3 more
Seachem® CupriSorb™ - Copper & Heavy Metal Absorbent
(0)
$9.97
$14.99
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+ 3 more
Seachem® Matrix Carbon™
(0)
$8.29
$9.99
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+ 3 more
Seachem® The Bag ™ Welded Filter
(4)
$9.99
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+ 3 more
Seachem Flourish Potassium™
(6)
$11.99
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Seachem® Clarity™
(16)
$9.79
$14.99
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Seachem® Purigen®
(10)
$66.09
$74.39
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+ 1 more
Seachem® Flourish Excel™
2 sizes
(2)
$37.89 - $66.79
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+ 1 more
Seachem® Flourish®
(4)
$37.59
$39.89
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+ 1 more
Seachem® Phosguard™
2 sizes
(4)
$32.30 - $60.99
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+ 1 more
Seachem® Tidal™ 75 Zeolite Filter Pouch
(0)
$8.19
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+ 2 more
Seachem® Tidal™ 110 MatrixCarbon
(0)
$20.99
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+ 2 more
Seachem® Tidal™ 75 Matrix Carbon
(0)
$10.19
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Seachem® Tidal Matrix™
(0)
$7.69
$12.29
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Seachem® Tidal Matrix™
(0)
$7.69
$11.29
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Seachem® Tidal ™
(0)
$9.99
$16.88
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+ 2 more
Seachem® Tidal ™
(0)
$6.99
$10.99
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+ 2 more
Seachem® Tidal ™
(0)
$9.49
$11.69
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Seachem® Marine Buffer™
(0)
$23.19
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+ 1 more
Seachem® Reef Complete™
(0)
$10.59
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+ 1 more
Seachem® Tidal™ Zeolite
(0)
$13.49
$14.99
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+ 2 more
Seachem® Marine Buffer
(2)
$9.99
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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.