Actually a water change will suffice to reduce ammonia. A planted tank itself will usually reduce ammonia as well. Gold fish are very sensitive, much sensitive than your normal community fishes. Perhaps due to the generation of cross breeding, usually I won't be so adventurous to go try a product that fetches less than 10 links from google. Not many people uses Amnolock, neither do I, so there is simply insufficient information. Those available links just shows similar cases as you. Suggest you don't use first till you can source out more info for the time being.
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