API

API STRESS COAT Aquarium Water Conditioner 16-Ounce Bottle

1766+ bought in the past month

$10.98

About this item

  • 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
$10.98

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Product details

BrandAPI
Liquid Volume0.48 Liters
Item Weight0.4 Pounds
Item FormLiquid
ManufacturerMars Fishcare

Technical specifications

item_weight0.4 Pounds
departmentUnisex-Adult
manufacturerMars Fishcare
item_model_number85C
date_first_availableJune 15, 2004
item_package_dimensions_l_x_w_x_h8.46 x 2.29 x 2.24 inches
item_dimensions_lxwxh5 x 1 x 5 inches
brand_nameAPI
target_audience_keywordfish
directionsUse when setting up an aquarium, adding or changing water, when adding new fish, or when fish are damaged by injury or disease. Using dosing cap on bottle, add 5 ml per 10 gallons of aquarium water. Double the dose to replace slime coat and to repair damaged skin and fins. Use STRESS COAT together with API STRESS ZYME to assure good water quality and a healthy, clean aquatic environment.
country_of_originUnited States
model_nameSTRESS COAT, 16 OZ
colorMulti-colored
size16 fl oz
materialPlastic
number_of_items1
styleAquarium Treatment without Pump
breed_recommendationAll Breed Sizes
is_discontinued_by_manufacturerYes
product_dimensions5 x 1 x 5 inches; 6.4 ounces
best_sellers_rank#848 in Pet Supplies ( See Top 100 in Pet Supplies ) #3 in Aquarium Water Treatments

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Customer reviews

4.837,868 ratings

Customers say

Customers find this water conditioner effective, noting it works instantly and helps maintain proper levels in their aquariums.

★★★★★

5/5 Great for my fish

J HarrisAugust 12, 2025

5/5 – Great for Fish Health and Clear Water I’ve been using API Stress Coat for years, and it’s 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 — just a small amount treats many gallons. I use it during water changes and whenever I introduce new fish, and I’ve noticed my fish stay calmer and healthier. It doesn’t cloud the water, and I’ve 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. Read more

★★★★★

Super Value Of Great Product

Stephen ElmoreAugust 16, 2025

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 . Read more

★★★★★

Stressed pond

MelissaDecember 24, 2025

Tremendous product. Restores slime coat and brings a calm to the pond. Read more

★★★★★

Magic in a Bottle for Your Aquarium!

TyeJanuary 18, 2024

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 doesn’t want to constantly repurchase supplies. The application process is straightforward and easy – just follow the instructions on the bottle. The most impressive part is its effectiveness. Since using this conditioner, I’ve 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 you’re a beginner or an experienced fishkeeper, this product is a must-have in your aquarium care toolkit. It’s a small investment for the huge benefit it brings to the health and happiness of your aquatic pets. Read more

★★★★☆

For my house plants

Susan WilesOctober 10, 2025

I add just a little bit to my house water for my houseplants weekly. Plus I use in our fish tank. Double use. Very easy to use and pleased with the outcome. Read more

★★★★★

Great stress Coat

DennyJanuary 4, 2026

very good stuff. heels fish pretty fast makes fins grow back pretty fast also . Read more

★★★★★

Cheap insurance to have beautiful and healthy fish!

StewartBJanuary 20, 2025

The media could not be loaded. I use this in my small pond and my aquariums. Whenever I add new fish I use API Stress Coat. I get a lot of my pond and aquarium fish shipped to me. Sometimes fish can get injured from the packing and shipping process. Plus it does stress them out a lot. I use API Stress Coat every time I add fish to my pond or aquariums, and as of now I have a 100% success rate. The fish just thrive. I use it as directed and I have peace of mind. In addition, buying pond and aquarium fish, especially on-line can be expensive. Especially when shipping costs are added. Using API Stress Coat is cheap insurance. I would rather use API Stress Coat and be proactive rather than having to cure an injured and / or sick fish. IMHO, it's worth it. (Oh yeah. I thought I'd point out that the Sarasa Goldfish and Shubunkin Goldfish you see in the pictures were purchased here on Amazon. We bought them from Toledo Goldfish right here. Beautiful and healthy fish. This is not a plug for Toledo Goldfish. Just an FYI if you are looking for beautiful and healthy goldfish.) Read more

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