API Stress Zyme Aquarium Bacterial Cleaner 118mL

API Stress Zyme 118mL is a beneficial bacteria treatment designed to help keep freshwater and saltwater aquariums cleaner by naturally breaking down organic waste, sludge and uneaten food. Regular use helps reduce waste build-up in aquarium gravel, decorations and filtration systems, making routine fish tank maintenance easier.

Containing more than 300 million live bacteria per teaspoonful, API Stress Zyme supports a cleaner aquarium environment and helps maintain biological activity in established fish tanks.

Why Choose API Stress Zyme?

• Breaks down organic waste: Beneficial bacteria help consume sludge, uneaten fish food and decomposing organic material.
• Helps keep gravel cleaner: Reduces the accumulation of organic debris in aquarium substrates and hard-to-reach areas.
• Supports biological filtration: Helps maintain beneficial bacterial activity in your aquarium.
• Reduces maintenance: Regular use can help manage organic waste build-up between aquarium cleanings.
• Suitable for freshwater and saltwater: Can be used in tropical fish tanks, goldfish aquariums, cichlid tanks and marine aquariums.
• Simple weekly treatment: Easy liquid dosing makes it suitable for regular aquarium maintenance.

How API Stress Zyme Works

Uneaten fish food, fish waste and decaying plant material can collect in aquarium gravel, filters and decorations. As this material breaks down, it contributes to organic sludge and increases the demands placed on your aquarium's filtration system.

API Stress Zyme introduces live bacteria that help break down these organic materials, supporting a cleaner aquarium and reducing the build-up of debris over time.

For best results, combine API Stress Zyme with regular water changes, gravel cleaning and appropriate aquarium filtration.

How to Use API Stress Zyme

Shake the bottle well before use.

• Regular maintenance: Add 5mL per 38 litres of aquarium water once per week.
• New aquarium start-up: Add 10mL per 38 litres at start-up, then continue the doubled dosage weekly for two additional weeks, following API's instructions.
• Established aquariums: Use weekly to help manage organic waste and maintain biological activity.
• Application: Add directly to the aquarium according to the manufacturer's instructions.

At the standard weekly dosage, the 118mL bottle provides approximately 23 treatments for a 38-litre aquarium, or enough for approximately 897 litres of total treatment volume.

Important: API Stress Zyme does not replace regular water changes, aquarium cleaning or water testing. It is not a substitute for establishing an effective nitrogen cycle.

Product Specifications

• Brand: API
• Product: Stress Zyme Aquarium Bacterial Cleaner
• Size: 118mL
• Type: Live bacterial aquarium maintenance treatment
• Suitable for: Freshwater and saltwater aquariums
• Bacteria concentration: Over 300 million live bacteria per 5mL
• Standard dosage: 5mL per 38 litres weekly
• Primary function: Breaking down organic sludge and debris

Frequently Asked Questions

What does API Stress Zyme do?

API Stress Zyme contains beneficial bacteria that help break down organic sludge, uneaten food and other waste in freshwater and saltwater aquariums. Regular use can help keep gravel and aquarium surfaces cleaner.

Is API Stress Zyme the same as API Quick Start?

No. API Stress Zyme primarily helps break down organic waste and sludge. API Quick Start is formulated to introduce nitrifying bacteria that help establish and support the aquarium nitrogen cycle.

Can I use API Stress Zyme with fish in the aquarium?

Yes. API Stress Zyme is designed for use in established aquariums containing fish when used according to the manufacturer's instructions.

How often should I add API Stress Zyme?

API recommends adding 5mL per 38 litres of aquarium water weekly for routine maintenance. New aquariums may require the manufacturer's recommended start-up dosage.

Does API Stress Zyme remove ammonia and nitrite?

API Stress Zyme helps break down organic waste but should not be relied upon to directly control ammonia or nitrite. Proper biological filtration, water testing and aquarium cycling remain essential.

Can API Stress Zyme replace water changes?

No. Although it helps reduce organic sludge, regular water changes remain necessary to manage dissolved waste and maintain healthy aquarium water conditions.