Used for 2 tank cycles. I didn't count "drops" and used a syringe dispenser instead. I have found that 1ml gives around 0.5ppm ammonia (using the API master kit to measure a few hours after dosing or even the next day). So I used 2ml to get 1.0ppm tail ready for my 5 gallons. However YMMV. Just write down what you compare to your levels and you will quickly understand what you need.
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