Active ingredient: Seachem Stability: Blend of aerobic, anaerobic and facultative bacteria in spore form (Seachem does not call them 'nitrifying' but says they break down ammonia, nitrite and nitrate). API Quick Start: Live nitrifying bacteria. FritzZyme 7: Live freshwater-specific nitrifying bacteria
How to use (from the label): Seachem Stability: 5 mL per 40 L on day 1, then 5 mL per 80 L daily for 7 days; UV/ozone off. API Quick Start: 10 mL per 10 US gal (38 L); double for saltwater; also after changing water/filter media or after medicating. FritzZyme 7: New system: 119 mL (4 oz) per 10 US gal (38 L); maintenance 30 mL per 10 US gal; dechlorinate first; UV off before and 4 days after
Careful: Does not replace testing: monitor ammonia and nitrite daily while cycling; cycling still typically takes weeks.
Never mix medicines unless the label says it is safe, and remove shrimp and snails unless the label says they are safe.
Examples you may see in shops: Seachem Stability, API Quick Start, Fritz Zyme 7. Not endorsements. Always follow the label.
4 facts checked with sources