Deck the fins

Make their tank merry with deals on meals, décor & aquatic essentials

Water Care & Conditioning

(79 results)
Top Fin® Pre-Conditioned Aquarium Water - Fish Tank Care - 2.5 Gallon
(253)
$16.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 2, get the 3rd 50% OFF ALL Top Fin conditioned water
+ 3 more
Seachem® Prime® Aquarium Water Conditioner Chlorine & Ammonia Detoxifier
4 sizes
(385)
$3.19
$6.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Top Fin® Pre-Conditioned Betta Aquarium Water - 1 Gallon
(12)
$12.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 2, get the 3rd 50% OFF ALL Top Fin conditioned water
+ 3 more
Seachem® Stability® New Tank Stabilization System Aquarium Water Conditioner
2 sizes
(214)
$5.49
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® Stress Coat Tap Water Aquarium Conditioner for Tap Water Dechlorinating
6 sizes
(544)
$2.28
$4.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Top Fin® Aquarium Water Conditioner - 4-16 fl oz
3 sizes
(261)
$4.99
$5.49
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® Quick Start Aquarium Cycling Water Conditioner
3 sizes
(312)
$8.68
$8.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Seachem® Prime® Chlorine & Ammonia Detoxifier
2 sizes
(11)
$52.11
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 2 more
Top Fin® Readistart Aquarium Nitrifying Bacteria Starter - 4-8 oz
2 sizes
(176)
$7.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® Aquarium Salt for Fish Tanks
3 sizes
(193)
$8.78
$8.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® ACCU Clear Aquarium Water Clairifier for Cloudy Aquarium Water
2 sizes
(315)
$5.58
$7.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Seachem® Stability® for Aquarium Cycling
2 sizes
(8)
$48.11
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 2 more
Top Fin® Betta Aquarium Water Conditioner - Fish Tank Care - 2-4 fl oz
2 sizes
(132)
$2.99
$3.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Top Fin® Pre-Conditioned Betta Aquarium Water - 32 fl oz
(42)
$2.19
$4.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 2, get the 3rd 50% OFF ALL Top Fin conditioned water
+ 3 more
API® Melafix Fish Bacterial Infection Treatment - 4 oz for Bacterial Infections & Fin Rot
(9)
$8.18
$9.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® Pimafix Fish Fungal Infection Treatment - 4 oz for Fungal Infections
(0)
$7.18
$9.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® Stress Zyme Aquarium Water Conditioner for Aquarium Cycling
3 sizes
(93)
$10.58
$11.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Natural Rapport Aquarium Gravel Cleaner Aquarium Water Treatment
(23)
$15.99
$17.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Seachem® Matrix™ - Aquarium Filter Media
3 sizes
(20)
$8.79
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Save 40% On First Autoship Order of Aquatic Filter Media
+ 3 more
Fritz Aquatics Nature Box Catappa Leaves Natural Water Conditioner
(28)
$11.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 2 more
API® Aqua Essential for Tap Water Dechlorinating
2 sizes
(72)
$8.68
$11.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Top Fin® Freshwater Aquarium Starter Kit - Fish Tank Care - 2 Count
(53)
$6.99
$14.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Aqueon® Pure Bacteria Supplement for Aquarium Cycling
(51)
$9.29
$9.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Top Fin® Biological Cleaner Aquarium Water Treatment - 4-16 fl oz
2 sizes
(62)
$5.89
$8.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Seachem® Purigen® Aquarium Water Treatment
(10)
$57.19
$115.31
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 2 more
Tetra® SafeStart Aquarium Cycling Water Conditioner
(108)
$10.47
$11.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® Algaefix Aquarium Algae Control
3 sizes
(445)
$9.49
$9.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Tetra® EasyBalance Nitraban Aquarium Water Treatment Nitrate Control for Fish Tanks
(71)
$13.99
$14.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API® Ammo Lock Ammonia Detoxifier
(46)
$10.99
$11.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
Tetra® AquaSafe Plus Aquarium Dechlorinator Water Conditioner for Tap Water Dechlorinating
3 sizes
(180)
$6.32
$7.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
biOrb® Complete Care - Aquarium Fish Tank Water Care - 100 mL
(0)
$11.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
biOrb® Water Optimizer - Aquarium Fish Tank Water Care - 100 mL
(0)
$10.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
Fluval® Betta Water Conditioner for Betta Fish Tank Aquariums - 0.84 fl oz
(0)
$2.99
$3.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Save 25% on select Fluval betta products, price displayed
+ 1 more
Fluval® Tap Water Conditioner with PHE for Planted Fish Tank Aquariums - 8 fl oz
(0)
$9.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
Tetra® WaterClarifier - Clears Cloudy Aquarium Water for Freshwater Aquariums
2 sizes
(92)
$5.32
$5.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 1 more
Top Fin® Pre-Conditioned Almond Leaf Betta Water - Fish Tank Care - 32 fl oz
(0)
$6.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 2, get the 3rd 50% OFF ALL Top Fin conditioned water
+ 1 more
TetraPond GreenFree UV Clarifier for Clear Pond Water
2 sizes
(0)
$179.99
Options from
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 2 more
API Chlorine & Heavy Metal Neutralizer Pond water Conditioner for Pond Water Care
(0)
$26.98
$33.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API Pond Aqua Essential for Pond Water Care
(0)
$16.98
$23.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
API Stress Zyme Water Conditioner for Aquarium Cycling
(14)
$5.88
$6.99
Earn $10 back in savings (5,000 points) when you spend $39+ with Free Same-Day Delivery thru 11/8. One-time use.
Buy 1 Get the 2nd 25% OFF on ALL Aquatic Food & Watercare! Excludes Top Fin® pre-conditioned water.
+ 3 more
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Keeping your pet fish’s tank in great shape involves using the right aquarium water care and conditioning products. In order to keep the water in your aquarium in great condition, you will occasionally need to purchase these products so your fish can live their best life. Pet parents can find the aquarium water care, aquarium water conditioner, and other aquarium supplies they need at PetSmart. 
Our collection of aquarium water care and conditioner supplies includes products like: 
Aquarium Water Conditioner
Pre-Conditioned Water
Aquarium Salt
Fish Tank Water Clarifier
Turtle Tank Water Cleaner
Algae Control
Ammonia Remover Pads
Bacteria Supplements
Fish Tank Dechlorinator
Fresh Water Starter Kits
Goldfish Minerals
And More
You are sure to find the exact fish tank water supplies you need at PetSmart. Need something else for your pet fish while you’re here? We sell fish disease treatment, fish food, fish feeders, fish tank plant care, fish pond care, saltwater aquarium care, fish tank water quality testers, and more. 
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.