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Top 10August 2025

Best Freshwater Fish Tank Ph/alkalinity Up

We made a list of the top 10 Freshwater Fish Tank Ph/alkalinity Up based on verified reviews, popularity and other factors which we summarized for you in this list.

Best Choice

API pH UP Freshwater Aquarium Water pH Raising Solution for fish,4-Ounce Bottle, Brown

API pH UP Freshwater Aquarium Water pH Raising Solution for fish,4-Ounce Bottle, Brown

✓Contains one (1) API pH UP Freshwater Aquarium Water pH Raising Solution 4-Ounce Bottle
✓Raises freshwater aquarium water pH with a phosphate-free formula
✓Does not promote growth with pH adjustments and is safe for plants and fish
✓Slowly neutralizes acidic substances that cause low water pH
✓Test water weekly and use to correct pH level in freshwater aquariums

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30% Discount

API pH DOWN Freshwater Aquarium Water pH Reducing Solution 4-Ounce Bottle

API pH DOWN Freshwater Aquarium Water pH Reducing Solution 4-Ounce Bottle

✓Contains one (1) API pH DOWN Freshwater Aquarium Water pH Reducing Solution 4-Ounce Bottle
✓Lowers freshwater aquarium water pH with a phosphate-free formula
✓Does not promote algae growth with pH adjustments and is safe for plants and fish
✓Slowly neutralizes alkaline substances that cause high water pH
✓Test water weekly and use to correct pH level in freshwater aquariums
✓This product contains 9.6% of sulfuric acid

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16% Discount

API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit

API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit

✓Contains one (1) API pH TEST & ADJUSTER KIT 250-Test Freshwater Aquarium Water pH Test and Adjuster Kit, including 1 bottle of testing solution, 2 bottles of pH adjuster, 1 color card and 1 test tube with cap
✓Helps monitor and adjust pH and prevent invisible water problems that can be harmful to fish
✓Reads pH 6.0 - 7.6 and includes API pH UP and pH DOWN to adjust to proper level
✓Designed for use in freshwater aquariums only
✓Use for weekly monitoring and when water or fish problems appear

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API PROPER pH 8.2 Freshwater Aquarium Water pH Stabilizer 7.4-Ounce Container

API PROPER pH 8.2 Freshwater Aquarium Water pH Stabilizer 7.4-Ounce Container

✓Contains one (1) API PROPER pH 8.2 Freshwater Aquarium Water pH Stabilizer 7.4-Ounce Container
✓Sets and stabilizes water pH to 8.2 to help keep fish healthy and colorful
✓Ideal for saltwater, brackish and african cichlid aquariums
✓Use exclusively in aquariums that do not contain live plants
✓Use when setting up a new aquarium, adjusting pH in an established aquarium or changing water

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23% Discount

API AQUARIUM START UP PACK Water Conditioner 1.25-Ounce Bottle 2-Pack

API AQUARIUM START UP PACK Water Conditioner 1.25-Ounce Bottle 2-Pack

✓Contains one (1) API AQUARIUM START UP PACK Water Conditioner 1.25-Ounce Bottle 2-Pack
✓Makes tap water safe for fish and reduces fish stress.
✓Starts aquarium cycle and allows instant addition of fish.
✓Comes with two API products, STRESS COAT and QUICK START, for a healthy start-up aquarium.
✓Use when starting a new aquarium, changing water, or adding fish. Add STRESS COAT first and then QUICK START.

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API PROPER pH 7.0 Freshwater Aquarium Water pH Stabilizer 8.8-Ounce Container

API PROPER pH 7.0 Freshwater Aquarium Water pH Stabilizer 8.8-Ounce Container

✓Contains one (1) API PROPER pH 7.0 Freshwater Aquarium Water pH Stabilizer 8.8-Ounce Container
✓Sets and stabilizes water pH to neutral to help keep fish healthy and colorful
✓Removes toxic compounds from tap water to make it safe for fish
✓Use exclusively in freshwater aquariums that do not contain live plants
✓Use when setting up a new aquarium, adjusting pH in an established aquarium or changing water

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KORDON #35316 pH Increase Adjuster for Aquarium, 16-Ounce

KORDON #35316 pH Increase Adjuster for Aquarium, 16-Ounce

✓RAPIDLY ALTERS pH LEVELS: Easily adjust the pH levels in your aquarium with KORDON pH Increase Adjuster, a fast-acting solution for making your water more alkaline.
✓WORKS IN BOTH FRESH AND SALTWATER TANKS: This versatile pH adjuster is perfect for use in all aquariums, providing a reliable and effective way to balance the pH levels.
✓WORKS WELL WITH pH STABILIZERS: Formulated to work seamlessly with pH stabilizers, ensuring a stable and healthy pH level for your fish tank.
✓SAFE FOR ALL AQUATIC LIFE: Manufactured using only the finest quality ingredients in the USA. Treats up to 2,800 gallons.
✓DUPLICATE NATURAL WATER CONDITIONS: Replicate the natural water conditions where your fish evolved, providing them with a healthy and thriving environment.

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Tetra Correct pH Tablets 8 Count, For aquarium Water

Tetra Correct pH Tablets 8 Count, For aquarium Water

✓MAINTAINS NEUTRAL pH: Helps maintain ideal pH levels in aquarium water.
✓REDUCES STRESS TO FISH: Maintaining recommended pH levels is vital to ensuring a healthy environment.
✓EASY TO USE: Holds proper pH for several weeks.
✓CONVENIENT: Each fizz tab is pre-measured and ready for use.
✓USAGE: Test water and use monthly to help maintain your aquarium pH levels.

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Brightwell Aquatics pH+, pH Increaser for All Marine and Freshwater Aquariums - 125 ml

Brightwell Aquatics pH+, pH Increaser for All Marine and Freshwater Aquariums - 125 ml

Brightwell Aquatics

✓Increases pH in marine and reef aquaria.
✓While not intended to act as a permanent solution to such issues, pH+ may be used as needed until the cause of depressed pH is remedied.
✓May be used to help increase pH in aquaria that have adequate alkalinity yet have chronically-depressed pH levels.
✓Composed of purified water and ultra-high purity materials; formulated by a marine scientist.

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KORDON #35326 pH Decrease Adjuster for Aquarium, 16-Ounce

KORDON #35326 pH Decrease Adjuster for Aquarium, 16-Ounce

✓GRADUALLY LOWERS pH LEVELS: Easily adjust and lower the pH levels in your aquarium with KORDON pH Decrease Adjuster, a fast-acting solution for making your water more acidic.
✓WORKS IN BOTH FRESH AND SALTWATER TANKS: This versatile pH adjuster is perfect for use in all aquariums, providing a reliable and effective way to balance the pH levels.
✓WORKS WELL WITH pH STABILIZERS: Formulated to work seamlessly with pH stabilizers, ensuring a stable and healthy pH level for your fish tank.
✓SAFE FOR ALL AQUATIC LIFE: Manufactured using only the finest quality ingredients in the USA. Treats up to 2,800 gallons.
✓DUPLICATE NATURAL WATER CONDITIONS: Replicate the natural water conditions where your fish evolved, providing them with a healthy and thriving environment.

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