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Product Information API Marine Stress Zyme 473 ml – Live beneficial bacteria for marine and reef aquariums that naturally breaks down sludge, fish waste, uneaten food, and organic debris. Helps maintain a healthy biological filter, improves water quality, keeps live rock and substrate cleaner, and reduces routine aquarium maintenance. Suitable for fish-only marine aquariums, reef tanks, and FOWLR systems. Made in the USA. Live Beneficial Bacteria for a Cleaner, Healthier Marine Aquarium Over time, fish waste, uneaten food, detritus and decaying organic matter accumulate inside live rock, sand beds and filter media. This organic waste can contribute to declining water quality, increased maintenance and elevated ammonia and nitrite if left unmanaged. API Marine Stress Zyme contains millions of live beneficial bacteria that naturally consume sludge and organic debris. Regular use helps maintain a strong biological filter, improves water quality and keeps live rock, coral bases, sand and aquarium glass cleaner with less manual maintenance. Unlike chemical cleaners, Marine Stress Zyme works biologically by supporting the natural bacterial population responsible for breaking down organic waste. Why Marine Hobbyists Choose API Marine Stress Zyme Contains millions of live beneficial bacteria Naturally consumes sludge and organic debris Helps keep live rock cleaner Reduces organic waste accumulation Supports a healthy biological filter Improves overall water quality Helps reduce aquarium maintenance Suitable for fish-only and reef aquariums Safe for marine fish, corals and invertebrates Made in USA Key Benefits Helps break down fish waste Reduces sludge buildup Supports beneficial bacterial colonies Helps maintain stable biological filtration Keeps sand beds cleaner Helps maintain cleaner live rock Improves oxygen-demanding organic decomposition Ideal for routine weekly maintenance Dosage Regular Maintenance Add 5 ml per 38 litres (10 US gallons) once every week. New Marine Aquarium Double the normal dosage during initial setup. Continue the higher dose for the first 2 weeks to help establish the biological filter. Shake well before use. Suitable For Marine Aquariums Reef Aquariums FOWLR Systems Fish-Only Marine Tanks Live Rock Systems Soft Coral Aquariums SPS & LPS Reef Systems Marine Quarantine Tanks Expert Recommendation from Something Fishy Marine Stress Zyme is not a substitute for good filtration or protein skimming. It works best as part of a complete maintenance routine that includes regular water changes, efficient mechanical filtration, protein skimming and nutrient testing. For reef keepers, we recommend combining it with regular testing of ammonia, nitrite, nitrate and phosphate to maintain long-term stability.