Seachem AmGuard is a liquid ammonia detoxifier for freshwater and saltwater aquariums. It neutralizes free ammonia (NH3) and ammonium (NH4+) within minutes. One dose stays active for up to 72 hours.
AmGuard converts ammonia to a non-toxic form that the biofilter can still consume. It can be used during tank cycling, after a fish-in emergency, or as a precaution before water changes. It does not alter pH and is reef and invertebrate safe at the recommended dose. It does not dechlorinate water.
Dose directly into the tank or sump where flow is good. A total-ammonia test (Nessler or salicylate type) may still read ammonia after dosing, because it detects both free and bound ammonia. Use a free-ammonia or NH3-specific test to confirm results.
- Type
- Liquid ammonia detoxifier
- Water type
- Freshwater and saltwater
- Sizes
- 100 mL, 250 mL, 500 mL
- Standard dose
- 1 mL per 40 L (about 10.5 US gallons); neutralizes up to 1 ppm of free ammonia
- Emergency dose
- Up to 2x the standard dose for ammonia spikes (max 2 mL per 40 L)
- Re-dosing
- Every 48 to 72 hours until free-ammonia readings stay at zero
- Duration
- Active for up to 72 hours
- Affects pH
- No
- Reef safe
- Yes, at the recommended dose
- Origin
- USA