API Stress Coat Calculator
Makes tap water safe and contains Aloe Vera to protect fish.
Quick Stress Coat Calculator
The Ultimate Guide to API Stress Coat
When it comes to water conditioners, API Stress Coat occupies a unique niche in the hobby. While most products focus solely on the chemistry of the water, Stress Coat focuses on the biology of the fish itself. It’s not just a dechlorinator—it’s a physical protectant that uses the power of Aloe Vera to help fish heal.
What makes API Stress Coat unique?
The "active" difference in Stress Coat is the inclusion of Aloe Vera. Fish depend on a delicate layer of mucus, known as a "slime coat," to protect them from bacteria, parasites, and fungi. Stressors like shipping, netting, or poor water quality can strip this layer away, leaving the fish vulnerable.
Stress Coat is scientifically proven to reduce fish stress and promote the healing of damaged tissue by forming a synthetic slime coat over wounds and torn fins. It literally "patches" the fish while their natural defenses recover.
When should you use it?
Because it is a dual-purpose product, there are two primary ways to dose it:
- For Water Changes: Use it as your standard dechlorinator to remove chlorine, chloramines, and heavy metals from tap water.
- For Healing/Stress: Use a double dose during times of illness, after netting or moving fish, or when you notice nipped fins from aggressive tankmates.
- New Tank Setup: It provides a protective barrier for fish being introduced to a brand-new environment, which is always a high-stress event.
Dosing for Precision
The standard dose for API Stress Coat is 5mL for every 10 gallons of water. To promote healing or replace a damaged slime coat, you should double the dose (10mL per 10 gallons). Our calculator above accounts for your tank's net volume, ensuring you don't waste product or under-dose during critical healing periods.
API Stress Coat: Frequently Asked Questions
Does Stress Coat detoxify Ammonia?
No. This is a common misconception. While API Stress Coat makes tap water safe by removing chlorine and chloramines, it does not detoxify ammonia or nitrites that are already present in the tank. If you have an ammonia spike, you should look for a product like Seachem Prime or perform an immediate water change.
Is it safe for turtles and frogs?
Yes. API Stress Coat is safe for all aquatic life, including amphibians and reptiles. The Aloe Vera is beneficial for their skin and shells just as it is for fish scales.
Will it make my protein skimmer go crazy?
Yes, it can. If you have a saltwater/marine tank with a protein skimmer, the organic compounds in Stress Coat (specifically the Aloe) can cause the skimmer to "over-foam" or overflow. If using it in a reef tank, you may need to turn your skimmer down or off for a few hours after dosing.
Can I overdose it?
Stress Coat has a very high safety margin. A 2x or even 3x dose is completely safe and often recommended for sick fish. However, very large overdoses can theoretically lead to oxygen depletion, so always stick as close to the recommended volume as possible.
Does it expire?
API Stress Coat has a long shelf life, but it should be stored in a cool, dark place. Most bottles are shelf-stable for several years, but if you notice the liquid has changed color significantly or developed a strange mold-like growth, it’s best to replace it.
Written by Richard James
Aquarist, author, and creator of ShrimpKeeper.co.uk. Helping hobbyists achieve professional results through precision dosing.
View My YouTube Channel & Books →