Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums, 2-oz bottle

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Dr. Tim's Aquatics Ammonium Chloride Solution for Cycling Aquariums is a reagent-grade ammonium chloride for use during fish-less cycling. With a concentration of 50 mg/L of total ammonia-nitrogen (TAN), a single drop is all you need for every gallon of aquarium water. Be sure to pair this trusted ammonium chloride solution with Dr Tim's Aquatics One & Only Live Nitrifying Bacteria for Freshwater Aquariums, Reef Aquariums, or Saltwater Aquariums to meet your needs.

Key Benefits

  • Reagent-grade ammonium chloride for use during fish-less cycling
  • 50 mg/L of total ammonia-nitrogen (TAN) concentration
  • Pre diluted ammonium chloride makes fish-less cycling easy and establishes aquarium biological filtration
  • Concentrated ammonium chloride solution treats up to 1,200 gallons. The pre-measured formula is easy to use; 1 drop per-gallon equals 2 ppm ammonia-nitrogen.
  • Does not contain scents or other dangerous additives


Ammonium chloride


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  • Item Number
  • Fish Type
    Marine Fish
  • Made in
    United States


Add 1 drop of solution per gallon of aquarium water to achieve an ammonia-nitrogen (NH3-N) concentration of 2 mg/L-N (2 ppm). Do not exceed 5 mg/L-NH3-N in the aquarium during cycling. Use an ammonia test kit to monitor your progress. 1 drop equals 0.05 ml so this bottle will treat 300 gallons.

Frequently Asked Questions

Does this bottle have an expiration date or does it never expire ?

Yes. We recommend adding ammonia 3 times during the fishless cycling period and a 2 ounce bottle is enough to dose a 100 gallon aquarium 3 times. So plenty to cycle your 36 gallon tank.

Does this solution contain chlorine? The label says it's NH3-N but name is Ammonium chloride.

The product is ammonium chloride dissolved in pure water. It does not have any chlorine in it. The ammonia is measured in units of NH3-N

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    Everything came in quickly. 2 days over 50 bucks. Always use chewy. Just wish they had more.

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