DrTim's Aquatics Ammonium Chloride Aquarium 100% Natural – 8 Oz. (Dr Tims Aquatics Ammonium Chloride | Saltwater Freshwater and Reef Aquariums, 100% Natural, 8 Oz)

Works well when doing a fishless cycle.

Perfect for fishless cycling of the tank. Includes a lot of product too so it can used on multiple tanks or setting up a tank again. Very effective at helping add and test ammonia levels in a fishless cycle.

I have used Dr. Tim’s Ammonium Chloride in two separate tanks. First my 5-gallon freshwater tank, and now my 10-gallon and it worked exactly as advertised. This product is perfect for anyone doing a fishless cycle using bottled nitrifying bacteria. ✅ Pros: Accurate dosing: The included dropper cap makes it easy to measure the right amount. The instructions are clear—4 drops per gallon for 2 ppm of ammonia. Safe & pure: No added dyes or surfactants that could harm beneficial bacteria. Speeds up cycling Great for beginners: It helps to follow the schedule instead of guessing if it is working or not. This is not a stand-alone cycling product—you’ll need to add a nitrifying bacteria culture or have an established filter for faster cycling. Test your water regularly with a liquid test kit to monitor progress. I love the API Freshwater Kit. If you're serious about fishless cycling, Dr. Tim’s Ammonia is a reliable and safe option that gives you full control over the process. It took the stress out of my first fish tank cycle, and I’d definitely use it again for future setups.

Awesome for getting a tank started with cycling. Great value for how concentrated it is. Way better than having that funky fish smell using fish flakes.

Does exactly what it's supposed to. I just set up a 200 gallon reef tank with 75 gallon sump. I dosed the system using the bottles instructions after having added One and Only. I tested the ammonia level the next day and it was right at about 2.0ppm - 2.5ppm. now to see if the One and Only acts as fast as claimed.

This stuff helped cycle my tank pretty quick. I was using it with Seachem Stability and saw nitrites show up in just a couple days, which was way faster than I expected. It’s a clean ammonia source and didn’t cloud the water or mess with the pH. Only issue I had was with the dosing—it says 4 drops per gallon but the cap has different markings and it’s not super clear how much to use if you need to redose. I ended up just testing a lot and going by that. Still, it did exactly what I needed it to do and I’d use it again, just wish the instructions were laid out better.

Great

Was perfect to help control exactly how much ammonia I was adding when cycling my tank.

Worked great to start up a fish tank

Used this to cycle my fish tank. Worked well and took all the guesswork out of the process.

This is the only ammonia source I could find which was specifically intended for cycling an aquarium. I am currently halfway through a fishless cycle (a couple of weeks in) on my new big tank and this seems to be working well - nitrites and nitrates are rising and ammonia is falling... so this works. Obviously make sure you read up on fishless cycling if you're not familiar, but otherwise this seems like a good product and a much better bet than buying household ammonia and hoping it will be safe.

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Its nice