API Stress Zyme Aquarium Cleaning Solution, 1.9 L Bottle for Freshwater & Saltwater Tanks

API STRESS ZYME is an aquarium cleaning solution designed to reduce routine maintenance in freshwater and saltwater aquariums, supplied in a 64-ounce bottle.

• More than 300 million live bacteria per teaspoonful — supplies bacteria that consume organic debris.
• For freshwater and saltwater aquariums — fits both aquarium environments.
• Weekly use — supports a regular aquarium-care routine.
• Consumes sludge and organic debris — helps keep gravel, glass and decorations clean.
• Supports the biological filter and natural aquarium cycle — helps maintain clean aquarium conditions.

Fish waste, uneaten food and other organic matter can build up in an aquarium and become difficult to remove, especially around gravel, rocks and coral. This solution is made for ongoing aquarium care: it works on organic debris as part of a weekly routine, helping reduce the need for repeated manual cleaning. Organic buildup can contribute to harmful water conditions, including ammonia and nitrite poisoning and breathing difficulty, so managing debris is an important part of aquarium maintenance.

How does API STRESS ZYME help clean an aquarium?

API STRESS ZYME contains live bacteria that consume sludge and organic debris. This action helps keep aquarium gravel, glass and decorations clean while supporting the natural aquarium cycle. The bacteria are intended to help maintain a strong biological filter, rather than physically scrub away buildup.

• Targets organic material such as fish waste and uneaten food.
• Helps with debris that can be difficult to remove from gravel, rocks and coral.

How often should I use it, and which aquariums is it for?

Use API STRESS ZYME weekly in freshwater and saltwater aquariums. Regular use supports a clean aquarium and a strong biological filter as part of your maintenance routine. Use the product as directed.

• Suitable for freshwater and saltwater aquarium care.
• Designed for ongoing use rather than a one-time cleaning task.

What comes in the bottle?

The bottle contains 64 ounces of API STRESS ZYME aquarium cleaning solution. Each teaspoonful contains more than 300 million live bacteria, which consume sludge and organic debris in the aquarium.

• One bottle of API STRESS ZYME Freshwater and Saltwater Aquarium Cleaning Solution.
• API has developed research-driven aquarium-care solutions for more than 50 years.

API STRESS ZYME is suited to aquarium keepers who want to manage organic buildup through regular care in a freshwater or saltwater tank. It works on sludge and debris to support a clean aquarium and its biological filter, making it a practical fit for weekly maintenance.