09-11-2011, 02:50 PM
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Live plants would quickly get this resolved, but of course goldfish eat plants. However, some fast-growing floating plants would work if you can get some. Even stem plants allowed to float. They assimilate a lot of ammonia and that is that.
Second thought, a bacterial supplement. Tetra's SafeStart and Seachem's Stability are two that work to establish nitrifying bacteria faster than otherwise. I always have lots of plants in my tanks so I don't need to bother, but if ever I set up a new tank without plants, I use one of these and have no issues.
Third, assuming the ammonia pack is doing its thing, the "ammonia" is actually ammonium. This doesn't explain why it is remaining, and I can't answer that. The two above suggestions would however resolve it, or should.
By the way, for the future, I would want to do something about the nitrates. These will eventually occur naturally in the aquarium, and without live plants nothing will be there to keep them in check. Most advise nitrates be below 20ppm with most tropical fish. I would either want live plants, or consider a water conditioner that detoxifies nitrate. Seachem's Prime does, not sure if there are others. The usual advice of more frequent water changes to control nitrates obviously doesn't work when they are being added with fresh water.