API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle

10 reviews
SKU: B000255MZG
Brand API
Liquid Volume 473 Milliliters
Item Weight 0.4 Pounds
Item Form Liquid
Target Species Fish
  • Contains one (1) API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle
  • Makes tap water safe and protects fish with dual-action formula
  • Removes chemicals from tap water that are harmful to fish
  • Replaces fish’s protective coat damaged by handling or fish fighting with healing power of Aloe Vera extract
  • Use when adding or changing water, when adding new fish and when fish are sick or injured


Product Description

Treat your tap water, and provide a safe environment for freshwater fish instantly and easily with API STRESS COAT Freshwater Aquarium Water Conditioner. Tap water contains chlorine, chloramines and ammonia which can cause gill and tissue damage, breathing difficulty, stress and death. API STRESS COAT Aquarium Water Conditioner works instantly as a water conditioner to remove chlorine and chloramines from tap water and neutralize heavy metals. API STRESS COAT Freshwater Aquarium Water Conditioner Treatment contains aloe vera, and it is scientifically proven to reduce fish stress by 40% and heal damaged fish tissue. This conditioner replaces the natural secretion of slime that is interrupted by handling, shipping, fish fighting, or other forms of stress and helps heal torn fins and skin wounds while promoting tissue regeneration. API STRESS COAT is recommended by professional fish handlers. With API aquarium products, it’s easy to keep a beautiful saltwater, freshwater or reef aquarium. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world. They work to provide a safe, hospitable environment for fish such as tropical community fish, cichlids, goldfish and more. At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too.

From the manufacturer

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It’s Smart To Be Proactive!

The best way to keep your aquarium clean is to maintain good water quality. This will keep your fish strong and vibrant, as well as preventing disease.

How Do I Maintain A Healthy Environment?

It is important to test your aquarium water weekly to verify good quality in addition to a bi-weekly partial water change of no more than 25% to help reduce toxic buildup, remove debris the filter missed, and replenish the oxygen available to fish.

How Do I Take Good Care Of My Aquarium & Fish?

  • Feed & observe fish daily
  • Test water quality weekly
  • Change 25% water every 2 weeks
  • Restore your ecosystem monthly

Feed Your Fish Daily

Feed your fish twice daily with API Fish Food which contains nutritionally enhanced proteins, allowing for easy uptake of nutrients and maximum absorption, resulting in less excrement for clear, clean water. Take time to observe fish to ensure they are active & healthy and be sure to check water temperature.

Test Water Quality Weekly

An aquarium is a closed environment and in order for fish to thrive, water must be similar to that which could be found in their natural environment. Poor water quality can cause fish stress, illness and even loss. The 6 common water quality parameters are Ammonia, Nitrite, Nitrate, pH, and water hardness (GH and KH) – all of which may vary over time and all are invisible to the eye which is why it is important to test weekly with API MASTER TEST KITS or API 5-IN-1 TEST STRIPS. It is also a good time to add API STRESS ZYME to keep your aquarium & gravel clean.

Change 25% Water Every 2 Weeks

In a closed aquarium environment there are no natural rivers or streams to carry away debris and other waste materials. It is important to renew 25% of the aquarium water every two weeks. When you change the water, it is important to know that tap water contains chemicals that make it safe for us to drink but harmful for fish, therefore add a water conditioner such as API STRESS COAT.

Restore Your Ecosystem Monthly

It is important to change your filter media & clean gravel monthly, however in doing so it can disrupt the fragile ecosystem of your aquarium. Use API QUICK START to strengthen it with ‘beneficial’ nitrifying bacteria that will naturally consume toxic compounds and help prevent fish stress. Also recommended when starting a new aquarium or changing the water.

boy feeding fish

Making A Better Underwater World

At API, we understand the rewards and relaxation of fishkeeping because we have a passion for fish too. For almost 60 years API has developed premium solutions with proven and effective results for your family and ours. API offers a range of testing kits, water conditioners, and nutritionally superior food, because we’re dedicated to making a better underwater world.

Important information

Safety Information

Please Read Instructions Before Use


Aloes, extract


As Labeled
To report an issue with this product, click here.

Free Standard Shipping with any online purchase of $100 (merchandise subtotal excludes store pick up items; merchandise subtotal is calculated before sales tax, before gift wrap charges, and after any discounts or coupons). Truck delivery and shipping surcharges on over-sized or extremely heavy items will still apply (these charges are indicated on the appropriate product information pages and will be displayed in the shipping subtotal of your order). Orders typically arrive within 3-6 business days. Items shipped directly from the vendor or to Alaska and Hawaii have longer delivery lead times. This offer does not apply to Alaska, Hawaii, Puerto Rico or Business Direct orders.

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10 reviews for API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle

  1. Jr

    I use this API all the time. Its great for conditioning water for changes or supplemental changes. I didn’t realize the size I bought for the price. I was quite happy when I received it. Would have cost a good bit more at the pet store!

  2. ASG

    Ran across an article recommending using 1 drop/gallon of water for watering my house plants. Noticed an improvement within 2 weeks time, indoor plants looked greener and more sturdy (no longer slightly wilting appearance). Now also using for my roses, and plumbago bushes outdoors with good results. In my area of Florida we have “hard” water. I used this product will I had a medium sized fish tank years ago. This product lasted a long time when I used for the fish tank. The 1 bottle I just ordered is going to last for a long time for my indoor plants, and outdoor plantings with noticeable results. If I knew ahead of time this product would have made such a quick noticeable difference, I would have taken before/after pictures of my plants.

  3. EJ in AZ

    Easy to use and maintain aquarium water, especailly after water changes. I always add some as I refill the aquarium after vacuuming it, and it seems to keep the fish healthy (especially with their slime coat, etc)

  4. Jane Metcalf

    I’ve always used this stress coat. It’s easily available and works well

  5. Christina Arista

    I use this for the water used for my plants! Takes all the minerals out that could be tough for your plants.

  6. jimmy white

    this is one item you must have to keep your fish happy and healthy!

  7. P. J.

    I use this sress coat in the tap water for my plants. You only have to use a small amount and the measure is in the cap. Stress coat takes the chlorine out and other whatever’s that are in the tap water.My plants are thriving, putting out new leaves, No burnt edges, leaf drop, root problems. No negative outcomes since using it. I highly recommend it.

  8. Snedds

    Love this for all of my tanks. This is the cheapest I’ve found it anywhere so I’m a repeat buyer

  9. Fish owner

    Great product


    Api quality
    Used before never had any issues

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