$4.54 First Time Autoship Price
this order
Save 35% (up to $20) today when you set up Autoship. 

$6.64 Autoship Price
(-5%) future orders
  • Keep saving 5% on every order
  • Get deliveries on your schedule
  • Skip, change, or cancel anytime
$6.99 Chewy Price
Save $1.29 (-16%)
$8.28 List Price
Promo, New Customers Only: Spend $49+, Get $20 eGift Card + Free Shipping with code: WELCOME

In Stock
FREE 1-3 day delivery on first-time orders over $35
Free 365-day returns

No interest if paid in full in 6 months on PayPal purchases of $149+. .

About This Item

Details

  • Reduces aquarium cycle prep so fish can be added instantly.
  • Works to make tap water safe and reduces fish stress.
  • Protects fish with the healing power of aloe vera.
  • Quick Start limits the amount of toxic ammonia and nitrite in the tank to help prevent fish loss.
  • Ideal for beginners, Stress Coat and Quick Start can be used together during water changes or when adding fish.

Instructions

FAQ

Learn More About API From Our Team of Experts

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.

Shop API

Questions & Answers

3 Customer Questions


Will this take the ammonia out?

Answer by Chewy • Oct 29, 2019
The API Quick Start included in this pack starts the natural aquarium cycle with beneficial bacteria. That bacteria converts toxic ammonia into harmless nitrate.

Is this safe for aquatic plants? Would I be able to put the product in and then add plants and my fish?

Answer by Chewy • Dec 27, 2018
This start-up pack is safe for aquatic plants. It's intended to be used when setting up an aquarium, adding or changing water, adding new fish, or when fish are injured or come down with disease.

how many gallons does it treats

Answer by Chewy • Oct 16, 2019
The Stress Coat bottle treats up to 60 gallons and the Quick Start bottle treats up to 30 gallons.
4.7
Rated 4.7 out of 5 stars
17 Ratings

5 Customer Reviews



Rated 3 out of 5 stars
By Mengmiao on Dec 27, 2025

Do no wash in dishwasher

Works great, pup loves it, although do not wash in dishwasher! I leave it on top rack as instructed and it came out broken

Works great, pup loves it, although do not wash in dishwasher! I leave it on top rack as instructed and it came out broken


Rated 5 out of 5 stars
By Kara on Sep 10, 2025

Convenient & a great back up plan

I have a 30 gallon fancy goldfish tank, I needed both of these items but had a hard time finding the medium sized bottles. This was the perfect solution so I didn't

I have a 30 gallon fancy goldfish tank, I needed both of these items but had a hard time finding the medium sized bottles. This was the perfect solution so I didn't run out for a while till I found the size I needed. Perfect. Excellent for a starter. Measure in teaspoons or drops, easy to follow instructions. Love this. Will order again if I need to. Great little set.


Rated 5 out of 5 stars
By Linda on Aug 8, 2025

New aquarium - by Freckles

Just starting an aquarium, used to saltwater, just getting used to freshwater again

Just starting an aquarium, used to saltwater, just getting used to freshwater again


Rated 5 out of 5 stars
By RRRR on Sep 27, 2019

Great for small tanks!

I generally prefer more a concentrated water conditioner but it is hard to get the dosage right for small tanks. Thats where API conditioner comes in - super easy

I generally prefer more a concentrated water conditioner but it is hard to get the dosage right for small tanks. Thats where API conditioner comes in - super easy to treat just 2 or 3 gallons for a water change.


Rated 5 out of 5 stars
By jamie on Apr 5, 2018

Happy fish

Happy with this purchase as it includes ammonia test as well.

Happy with this purchase as it includes ammonia test as well.