API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle
Original price was: $15.38.$10.99Current price is: $10.99.
Price: $15.38 - $10.99
(as of Oct 11, 2025 15:57:16 UTC – Details)
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.
Is Discontinued By Manufacturer : Yes
Product Dimensions : 5 x 1 x 5 inches; 6.4 ounces
Item model number : 85C
Department : Unisex-Adult
Date First Available : June 15, 2004
Manufacturer : Mars Fishcare
ASIN : B000255MZG
Best Sellers Rank: #886 in Pet Supplies (See Top 100 in Pet Supplies) #3 in Aquarium Water Treatments
Customer Reviews: 4.8 4.8 out of 5 stars 37,371 ratings var dpAcrHasRegisteredArcLinkClickAction; P.when(‘A’, ‘ready’).execute(function(A) { if (dpAcrHasRegisteredArcLinkClickAction !== true) { dpAcrHasRegisteredArcLinkClickAction = true; A.declarative( ‘acrLink-click-metrics’, ‘click’, { “allowLinkDefault”: true }, function (event) { if (window.ue) { ue.count(“acrLinkClickCount”, (ue.count(“acrLinkClickCount”) || 0) + 1); } } ); } }); P.when(‘A’, ‘cf’).execute(function(A) { A.declarative(‘acrStarsLink-click-metrics’, ‘click’, { “allowLinkDefault” : true }, function(event){ if(window.ue) { ue.count(“acrStarsLinkWithPopoverClickCount”, (ue.count(“acrStarsLinkWithPopoverClickCount”) || 0) + 1); } }); });
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
Instructions: Add 5 ml. for each 10 gallons of aquarium water. Double the dose to replace slime coat and to repair damaged skin and fins
Customers say
Customers find this water conditioner effective at maintaining proper levels and keeping fish healthy, with clear instructions for use. Moreover, the product helps reduce fish stress through its aloe Vera content, and customers report that their fish are happy and thriving. Additionally, they appreciate its value for money, particularly when purchasing in bulk through Amazon, and note that their fish have not died recently while using it.
11 reviews for API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle
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Original price was: $15.38.$10.99Current price is: $10.99.
J Harris –
5/5 Great for my fish
5/5 â Great for Fish Health and Clear WaterIâve been using API Stress Coat for years, and itâs one of my must-have aquarium products. It instantly removes chlorine and chloramines from tap water, making it safe for fish right away. I especially like that it contains aloe vera, which helps reduce fish stress and promotes healing of minor scrapes or torn fins.The 16-ounce bottle lasts a long time â just a small amount treats many gallons. I use it during water changes and whenever I introduce new fish, and Iâve noticed my fish stay calmer and healthier.It doesnât cloud the water, and Iâve never had any issues with it affecting my filtration or plants. The cap makes dosing easy, and the directions are clear.If you want a water conditioner that also supports fish health, this is a solid choice. Highly recommend for both beginner and experienced aquarium keepers.
Stephen Elmore –
Super Value Of Great Product
I’ve been using this stuff for years and I usually buy local but I saw the price , already had something in my cart so I added it to save me a trip to the pet big box store .I thought I was getting the usual small bottle and when it arrived and it was 16oz I immediately thought there was a mistake . I went back and looked and it was correct . I usually get 4oz for the same price (unless on sale) locally (big box per store) and I didn’t have to fight mall traffic only to search forever for a parking spot .When starting a new setup , doing a partial water change , or just adding water this stuff is a must . I add 1 gallon at a time to my 50 gallon tank and the 1 gallon mark doesn’t exist but I measured out the correct amount the first few times and now just approximate it using the cap to just about double what 1 gallon calls for . It works instantly , unlike some others , so I can do the needed addition at my convenience and the fish don’t seem to mind the fresh water going into the tank . No color , no change in chemical and biological balances and no smell .If you’ve got a fresh water tank you need this stuff .
Tye –
Magic in a Bottle for Your Aquarium!
Having a home aquarium can be a tricky endeavor, especially when it comes to maintaining a healthy environment for your fish. This product has been a game changer for me.Firstly, the 16-ounce size is very economical. It lasts quite a while even with regular use, which is great for someone who doesnât want to constantly repurchase supplies. The application process is straightforward and easy â just follow the instructions on the bottle.The most impressive part is its effectiveness. Since using this conditioner, Iâve noticed that my fish are visibly healthier and more active. Their colors are more vibrant, and they seem less stressed, especially after water changes or when introducing new fish to the tank. The product claims to reduce fish stress by 40% and it really seems to live up to that promise.Another major benefit is how it treats tap water. The conditioner neutralizes chlorine, chloramines, and heavy metals present in tap water, making it safer for the aquarium. This is crucial for the wellbeing of the fish and helps maintain a balanced ecosystem in the tank.Overall, I highly recommend the API STRESS COAT Aquarium Water Conditioner to any aquarium enthusiast. Whether youâre a beginner or an experienced fishkeeper, this product is a must-have in your aquarium care toolkit. Itâs a small investment for the huge benefit it brings to the health and happiness of your aquatic pets.
Miss Paula from South Beach, Miami, Florida –
All API products are good. Stress Coat is a miracle medicine.
I add API Stress Coat to all new water before it goes into my aquarium.I also add a enough hot water to make it the same temperature as the aquarium.Add an extra dose when add fish.Add an extra dose whenever fish appear ill or stressed.It truly is an first-resort, miracle medicine for fish.THE FOLLOWING REVIEWS ARE FOR ALL OF MY AQUATIC PURCHASES.I always read two dozen or more User Reviews for any product I buy.Amazon is honest and prints both the good and the bad reviews.I bought the following products from Amazon:>*****> Hagen Marina Ecoscaper Hydrocotyle Silk Plant.I am really pleased with this plant.And the fish like it too . . . no rough edges.It is just as pictured and looks so realistic.>*****> Hagen Exo Terra Water PLANT, Duckweed.It looks and floats just like real duckweed !I showed it to the aquatics people at Petco and they were impressed.>*****> Hydor Theo Submersible Aquarium HEATER 25W UL.Very small and easy to adjust; plus it can be placed completely underwaterin any position: vertical, horizontal, or on an angle.>*****> Hagen Elite Underwater Mini FILTER for up to 3 gallon tank.>*****> Hagen Elite Mini Internal FOAM 5 PACK replacement sponges.This is an excellent filter for my 5 gallon tank.It is well-made and powerful and could filter a 10 gallon tank.To reduce the water current to make it easy on my fish, I TOOK THE ADVICE FROM A USER REVIEWand bought a 5-pack of replacement sponge filters and used one sponge to completely cover the outflow valve.I also put a wee bit of the foam filter in the Venturi diffuser aerator.I set the aerator to low, which still provides ample aeration.I set the green filter power dial on the side of the filter to low to be just enough to create a good supply of aerating bubbles.I operated the aquarium for over a month without fish so that the water would be biologically perfect for them.Petco checks water samples for free.That little $9 dollar bio filter is just a wonder and so easy to maintain.Unplug the filter and remove it from the aquarium, then syphon off some aquarium water ( never use tap water) and squeeze the foam sponge in clean aquarium waterthree times or more until the final wash water is almost clear, then replace the sponge in the filter.I now have 5 Von Rio “Flame” Tetras doing very well in their new home.They do best when in a group of 5 or more, and in a low light environment, so I must have low-light live plants.I have a well-planted 5 gallon corner-type aquarium with a lid just for these 5 beautiful and hardy little orange fish.To provide shelter, there are lots of live Java ferns and wisteria plants at each end, plus the hydrocotyle silk plant to hide the filter and heater, and the plastic floatingduckweed to provide shelter from above.I purchased the silk hydrocotyle and plastic duckweed, because these live plants would perish in low light.Fish, like all living creatures, need shelter from real or perceived threats.Stress is the cause of most of life’s mental and physical illnesses.For many years, I have purchased almost every type of product from Amazon and never had a problem.Products are as advertised, or better, and Super Saver Shipping is fast and dependable.I recommended all of the above products to my friends.I tell everyone to save money and buy through Amazon ( including the aquatics people at Petco ).//
Billy Jo Mattingly –
Great for fins repair and water conditioning.
I mix with my water changes and if fins have been damaged, this costs and helps the fish heal.
chrissy –
Fish Whisperer
Use this solution whenever I change the tank water. Does calm fish down. Doesn’t cloud water, at least not for long. Good quality item. Arrived on time and well packaged.
Román Andrade –
Es un producto muy bueno para quitar cloro, cloraminas y metales pesados además de quitar el stress de los peces.
Kindle Customer –
Great product
StacyRavenFireHawk –
Lasts forever
Mrs C. –
Excellent product. I live in a hard water area and my houseplants have never thrived until I started using this product. Just a few drops in the watering can, and it transforms the water into soft water. Can also be added with liquid plant food at the same time. Very economical, as you only need a tiny amount!
Kimberly Walker –
Great product always use this in my tanks, donât think the biggest size of this jug is worth the amount of money at all as you can get the stress zyme largest jug for a bit cheaper. All in all itâs a great product and does what it should and my fish as thriving.