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API Stress Zyme Plus Biological Filtration Booster 237ml


API Stress Zyme by Aquarium Pharmaceuticals helps improve the development of the biological filter, as well as cleaning a dirty aquarium.

Keeps aquariums clean
Improves biological filter

  • Healthier Fish and Overall Water Quality
  • Improve the Development of the Biological Filter
  • Contains millions live bacteria to destroy gravel bed sludge
  • Can be used in Freshwater & Saltwater Aquariums

API Stress Zyme breaks down Organic Compounds that can cause dangerous conditions such as Ammonia and Nitrite poisoning and low oxygen levels.

A continuing use of Stress Zyme will assure an active biological filter, cleaner aquarium, healthier fish, and an overall good water quality. You do not have to keep this product refrigerated. StressZyme can be used in Fresh or Saltwater aquariums and when setting up or maintaining aquarium.

Instructions:Use API dosing cap included with bottle. To maintain a clean, healthy aquarium: add 1 tsp. (5ml) per 10 U.S. gallons weekly. For new aquariums, to help boost the biological filter: double the dose, use at start up, and for 2 additional weeks.


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Large Filters : Northern Ireland - £6.95, Rep Ireland - £12.95
Small Dry Goods : Northern Ireland - £2.95, Rep of Ireland - £4.95
LiveStock Delivery : Northern Ireland - £9.95, Rep Of Ireland - £16.98, UK Mainland - £24.50