API Proper pH 6.5 Aquarium Water Treatment, 8.5-oz bottle

Rated 5 out of 5 stars
$10.98 (-29%)Chewy Price
$15.48Chewy Price
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About This Item


  • Formulated to help set and stabilize pH at 6.5 for fish who thrive off of this level like Tetras, Dicus and Angelfish.
  • Specifically designed to help modify and maintain pH levels in freshwater aquariums.
  • Helps to remove chlorine and detoxify heavy metals, for a more habitable environment for your finned friends.
  • Contains aloe vera to help heal and regenerate damaged tissue, plus electrolytes to help prevent electrolyte imbalance.
  • Ideal for use during set up and water changes.

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Play Video: Learn More About API From Our Team of Experts
Learn More About API From Our Team of Experts

Test your aquarium's pH level with API's pH Test Kit, pH Test and Adjuster Kit or pH Test Strips.

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This Item – API Proper pH 6.5 Aquarium Water Treatment, 8.5-oz bottle
Rated 5 out of 5 stars
$10.98Chewy Price

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Total Price: $19.97

About API Water Conditioners

It’s Smart To Be Proactive!

The best way to keep your aquarium clean is to maintain good water quality. This will help keep your fish strong and vibrant and prevent disease. Water conditioners and test kits from API can help you keep your aquarium water safe and healthy.

How Do I Maintain a Healthy Environment?

It is important to test your aquarium water weekly to ensure it stays healthy for your fish.  In addition, a bi-weekly partial water change of no more than 25% will help reduce toxic buildup, remove debris the filter missed, and replenish the oxygen available to your fish.

Feed Twice Daily and Test Water Weekly

Feed your fish twice a day, check their water temperature, and observe them to make sure they are active. You should also test water quality weekly for optimal safety. For fish to thrive, their water must closely match that of their natural environment—poor water quality can cause stress, illness and even fish loss. The 6 important parameters for healthy aquarium water are ammonia, nitrite, nitrate, pH and water hardness (GH & KH). All of these can vary over time and are invisible to the eye.

Change Water and Restore the Ecosystem

In a closed aquarium environment, there are no natural rivers or streams to carry away debris and other waste materials. That is why you should replace 25% of your aquarium water every two weeks, making sure to add water conditioner to your tap water to make it safe for your fish. You should also change your filter media and clean your gravel monthly. Adding beneficial nitrifying bacteria with API Quick Start when you do will help restore your aquarium’s fragile ecosystem and avoid disruption.

What Do API Products Do and When Do I Use Them?

API Test Kits

Use test kits weekly to monitor water quality parameters, which can vary over time and impact the health of your fish.

API Stress Zyme

Using this every week will help keep your aquarium clean and your gravel and ornaments sludge-free.

API Algaefix

Use weekly to control algae growth and keep aquarium glass, ornaments and plants clean.

API Stress Coat

Use every 2 weeks during water changes to make tap water safe, and when adding fish, or when fish are injured.

About API

The team at API has a passion for fish and understands the rewards and relaxation fishkeeping can bring. For almost 60 years, they have developed premium products with a focus on proven and effective results. API offers a range of testing kits, water conditioners and nutritionally superior fish foods. They are dedicated to making a better underwater world for the benefit of fish and those who keep them.

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Questions & Answers

2 Customer Questions

How much to use for a 1.8 gallon tank? I’m getting a Amano shrimp and i am new to this. I want to know if I use Poland Spring water, would I even need this or how much I use. The ph level would have to be between 6.0 and 7.0
Answer by ChewyJul 23, 2019
Add 1 scoop for every 10 gallons of aquarium water. Repeat dose when pH test indicates a pH change of more than 0.2. The pH (or hydrogen-ion concentration) of spring water varies by spring and relies on several factors (like mineral levels, for example). API's Proper pH 6.5 Aquarium Water Treatment is designed to modify and maintain pH for several weeks while neutralizing harmful chlorine and toxic heavy metals.

Will this kill my live plants?
Answer by ChewySep 29, 2020
This solution should not be used in aquariums containing live plants.

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