API Ammo-Lock Ammonia Detoxifier, 16-Ounce

This is a great product. It helped lower the ammonia in my tank very fast and saved my fish.. Highly recommended!!

Ammonia spikes are quite common in fish tanks and in mine they seem to be an every day issue. I have a bottle of Prime, as well as Ammo Lock and about once a week I'll put in a capful of the Ammo Lock. My water clears up and the spikes go away, so I have been impressed with this item. Don't overdo it though, because you don't want your fish dying from over-use. So far for me it's been doing the job just fine.

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API Ammo-Lock Ammonia Detoxifier, 16-Ounce works great in my 55 gallon goldfish tank to decrease the ammonia level. Fish are happy & healthy. Definitely recommended!

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This must be working despite the daily measured ammonia level in the "dangerous" range. Despite filters the ammonia level in our goldfish tank remains very high (to test strip measurements). However, the fish live as long as I add 10 cc of Ammo Lock to a 10 gallon tank daily.

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Ammo-Lock is hydromethane sulfinate, it converts ammonia to ammonium. Ammonium is harmless to fish at levels found in an aquarium, but is used the same as ammonia by your nitrifying bacteria. It is also seen the same as ammonia with test strips, which give horribly inaccurate results. Sooooooo . . . the instructions summarize this: Add "recommended dose" based on tank size, add every two days until ammonia levels read zero. Check out the back of the bottle in the store, I'm not kidding.

Here's the kicker, if you convert ammonia to ammonium, and you use API ammonia test kits to check for ammonia, your ammonia levels will be off the charts despite it being "harmless". So your only method of true test at that point would be nitrites or nitrates, which if the ammonia was breaking down to nitrites or nitrates you wouldn't be having issues with ammonia. So this product might work, but you will never actually know since you can't test for it.

Here's another factor that gives it 1 star, and I see others didn't have a problem.

After adding the recommended dose to my tank (55 gallon reef), I lost my brittle star of 5 years in 48 hours, and every mushroom and polyps I had freaked out, about 1/4 of them died after a few weeks. All I wanted to do was "control" the ammonia for some spikes I was having due to adding two fish, but water changes would have been much better.

Try a different product to control your ammonia spikes, or simply do water changes frequently until its under control. This product stinks in my opinion. Thanks Amazon for the refund!