How much would i use for a 12l tank?

Use the instructions on the bottle and you won't have any problems.

Is this better than api stress coat?

Hi , not sure which is better for getting rid of chlorine and heavy metals , probably the same for that but the stress coat also helps the fish not stress so much and also helps fishes scales to heal better, essential tho also helps to keep any ammonia, nitrite away and also keeps nitrates down so really depends what you are wanting to use it for, 👍

How much would i need to add to a 100l tank? (uk)

2.6mls. It is 1ml per 38 litres

Api Aqua Essential | Desertcart Gibraltar

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Description

💧 Keep your aquarium flawless—because your fish deserve the best splash of care!

AMMONIA ARMOR - Continuously detoxifies harmful ammonia from fish waste and decaying matter, reducing stress and preventing fish loss.
MASSIVE COVERAGE - One 473 ml bottle treats up to 1,180 gallons—perfect for both freshwater and saltwater aquariums.
ULTIMATE WATER SAFETY - Instantly removes chlorine, chloramines, and heavy metals to protect delicate fish gills and ensure oxygen uptake.
EFFORTLESS MAINTENANCE - Safe to use during water changes with no risk of overdosing; keeps pH stable while promoting a healthy, thriving tank.
COMPREHENSIVE TOXIN DEFENSE - Effectively eliminates nitrites and nitrates, preventing suffocation and algae blooms for a pristine aquatic environment.

API Aqua Essential Aquarium Water Conditioner is a highly concentrated, instant-action formula that detoxifies tap water by removing chlorine, chloramines, heavy metals, ammonia, nitrites, and nitrates. Treating up to 1,180 gallons per 473 ml bottle, it safeguards fish health in both freshwater and saltwater tanks, reduces stress, and prevents common waterborne toxins from harming aquatic life. Trusted for nearly 60 years, API delivers premium water treatment solutions designed for effortless aquarium maintenance and vibrant fish vitality.

Specifications

ASIN	B096N3K99J
Allergen Information	Allergen-Free
Best Sellers Rank	4,692 in Pet Supplies ( See Top 100 in Pet Supplies ) 38 in Aquarium Water Treatments
Brand Name	API
Country Of Origin	USA
Customer Reviews	4.7 4.7 out of 5 stars (4,127)
Included Components	API AQUA ESSENTIAL Water Conditioner 473 ML bottle
Item Form	Liquid
Item Type Name	Water Treatment
Item Weight	612 Grams
Liquid Volume	16 Fluid Ounces
Manufacturer	API
Manufacturer Part Number	423E
Model Number	423E
Number of Items	1
Number of Packs	1
Pet Type	Fish
Product Warranty	2 year manufacturer
Target Species	Fish
UPC	317163054239
Unit Count	72 count

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£47