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Deal.ai › Seachem
Seachem
Seachem AmGuard

Seachem AmGuard

Best price now

$7.20at PADI-DjaChecked 1 h ago

64% under what the other stores charge

Compared across 12 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Best price today: $7.20 at PADI-Dja (checked Nov 12, 2026).
  • Checked at 12 stores.

Our take on the Seachem AmGuard

Seachem AmGuard is a liquid ammonia detoxifier for freshwater and saltwater tanks. One dose neutralizes free ammonia and ammonium within minutes and stays active for up to 72 hours, roughly twice as long as most competing detoxifiers. It converts ammonia into a form the biofilter still consumes, so it works during cycling and after a fish-in emergency without stalling the cycle. It does not change pH and is reef and invertebrate safe at the recommended dose.

Best forFish-in cycling and new tank setupsEmergency ammonia spikesQuarantine and hospital tanksReef and invertebrate systems
Pros
  • Neutralizes ammonia within minutes
  • Active for up to 72 hours per dose
  • Biofilter still consumes the converted ammonia
  • Does not alter pH
  • Reef and invertebrate safe at the recommended dose
  • Works in fresh and salt water
Cons
  • Does not remove ammonia, only detoxifies it
  • Requires repeat dosing to stay ahead of a spike
  • Overdosing beyond 2x the standard dose is not advised
  • Needs a test kit to confirm the tank is actually clear

Seachem AmGuard prices at every store

  • Squeaky's AquaticsNew

    In stock

    $4.61+ $7.70 shippingChecked 1 h ago
    Visit Squeaky's Aquatics
  • eBayNew

    In stockSold by gingerbread_pet_supplies

    $18.80+ $5.99 shippingChecked 1 h ago
    Visit eBay
  • WalmartNew

    In stock

    $21.89+ $6.99 shippingChecked 1 h ago
    Visit Walmart
  • PADI-DjaNew

    Availability unknownShips from Cameroon · duties may apply

    $7.20Checked 1 h ago
    Visit PADI-Dja
  • Care-A-Lot Pet SupplyNew

    Availability unknown

    $10.99Checked 1 h ago
    Visit Care-A-Lot Pet Supply
  • Fish Tanks DirectNew

    Availability unknown

    $14.99Checked 1 h ago
    Visit Fish Tanks Direct
  • ASAP AquariumNew

    Availability unknown

    $18.99Checked 1 h ago
    Visit ASAP Aquarium
  • The Fish GalleryNew

    Availability unknown

    $19.99Checked 1 h ago
    Visit The Fish Gallery
  • The WaterFront SLCNew

    Availability unknown

    $19.99Checked 1 h ago
    Visit The WaterFront SLC
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $21.89Checked 1 h ago
    Visit Amazon
  • Flow GobyNew

    Availability unknown

    $95.29Checked 1 h ago
    Visit Flow Goby
  • Galop-Store USNew

    Availability unknown

    $134.50Checked 1 h ago
    Visit Galop-Store US

Also available at

  • PetEsentialsCheck price at PetEsentials

Store links may earn us a commission.

Seachem AmGuard price history

Lowest price we've seen: $4.61 on Nov 13 at Squeaky's Aquatics. Tracked across 12 stores since Nov 13.

What reviewers say

Hobbyists treat AmGuard as a dependable emergency tool for ammonia spikes and fish-in cycles. They value the long active window and that it does not stall the biofilter, though some note it masks rather than removes ammonia.

What people mention
  • SpeedPraisedUsers report ammonia readings dropping within minutes of dosing.
  • DurationPraisedThe 72-hour active window is cited as longer than most rival detoxifiers.
  • BiofilterPraisedOwners say the cycle keeps progressing because the converted ammonia is still consumed.
  • Ammonia reboundCriticisedSome find ammonia returns if the source of the spike is not corrected.
  • DosingMixedHobbyists say the dose is simple but easy to misjudge without a test kit.

About the Seachem AmGuard

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

Questions and answers

Does AmGuard remove ammonia from the tank?
No. It converts free ammonia and ammonium into a non-toxic form that remains in the water and is consumed by the biofilter. Water changes are still needed to remove it.
Can I use AmGuard while cycling a tank?
Yes. The converted ammonia is still available to the biofilter, so the cycle continues. Test regularly and redose as needed.
Is AmGuard safe for reef tanks and invertebrates?
It is reef and invertebrate safe at the recommended dose. Do not exceed 2x the standard dose.
How does AmGuard differ from Seachem Prime?
Prime is a water conditioner that removes chlorine and chloramine and also detoxifies ammonia. AmGuard is a dedicated ammonia detoxifier with a longer active window, so the two are often paired.
How long does one dose last?
Up to 72 hours. Redose if ammonia is still detectable after that or after a large water change.
Does AmGuard change pH?
No. It does not alter pH in fresh or salt water.
Where is the Seachem AmGuard cheapest?
At PADI-Dja, for $7.20, 64% under what the other stores charge, as of our latest check.
Where can I buy the Seachem AmGuard?
13 stores we checked sell it, including Amazon, Squeaky's Aquatics, PADI-Dja, Care-A-Lot Pet Supply, Fish Tanks Direct.

Stores we've priced the Seachem AmGuard at

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